Acnu was so focused on trying to figure out what they were doing with this strange replica of herself. She knew of various things that were done disrespecting said god or goddess both directly and indirectly. What counts as either depends on the individual was even if someone else does not mean that way that does not mean the person it targeted towards would. Though it does not affect the deity in the divine realm how mortals think it does it still does in a way. It is just not how they think it does as it does depower them or cause them to lose faith. After all, they are the conception itself so the only way to do that would be somehow affect the concept itself. For magic deities like Acnu that was actually harder than mortals think as White Magic was more than just healing and support. That is just what it became over time.
Ancu wore white robes that looked very similar to what Healers normally wore. While she did not intervene in the mortal realm like those who were strict White Magic users like Healers she did. In fact, no deity actually did as what was seen as divine intervention was them paying more attention to that one mortal or mortals at a time allowing them to use more of their power for whatever purpose attracted their deity's attention. There is no actual interaction between the two at least from the normal perspective of things. It was more so a fair one sided interaction that was most mortals thinking they had interacted with a deity more than they actually had because what was viewed as interacting was different. Thus mortals were able to know what the gods and goddesses looked like but the connection they had to them was not akin to what Acnu was doing where she looked at the mortal realm through a reflection to see, hear, and view everything but the mortal could not do nothing in return (basically how you can watch someone on TV but they can not normally watch you back) at the most basic level. At the higher level, mortals would be able to see the deity they desired in return yet could never hear them only see them and make guesses on what they were doing with their limited information on a realm that is beyond their understanding and knowledge.
Despite all this, there was a way to influence the gods and goddesses in the divine realm from the mortal one yet it was never successfully carried out. That is to say, it was not originally done so as something happened before those mortals could stumble upon the concept themselves. However, through some means of acquisition by the Healer's Association, the concept was discovered and then honed until it was ready for what they thought it would do. That was they wanted to control healing magic itself. Assuming that Acnu was restricting them from using healing magic in the way that would be most effective and efficient in their mind. Minds that did not understand the true origins of White Magic or even what their school of magic actually was in reality thus they were hyper focused only on the healing and support aspect of it instead. Thinking that their goddess was a gatekeeper they just had to bypass to gain complete access to healing magic rather than actually be the source of all White Magic itself. This includes all kinds of healing, support, and defensive, and its true origins as offensive magic just like all magic was originally.
That process where the limited scope of a mortal would be attempted to be imposed on Acnu herself for just being herself as when she did not respond to how the Healer's Association and/or their members wanted it was not because she was not because of anything purposefully on her in. They had not caught her curiosity enough thus they did not have her attention or interest. This method to affect the divine realm from the mortal one was refined, perfected, and now being implemented. It was through the process of sending something directly through what was originally and only supported to be just a one way channel that allowed a deity to view the mortal realm not for it to interact with them.
However, the intent of the Healer's Association was not communication but control of something they view as rightful theirs. What was being transmitted was their version of control being placed upon Ancu. They wanted to be the ones that control and govern all healing magic itself so they used the method they discovered to make the connection. However, once it had managed to reach Acnu it was using her own power as it was originally intended at its original level as an attack against her.
Ancu felt a tingling in her hand and when she looked down at her hand that was when she saw it. Her hand had been changed from the normal organic looking hand to a white metallic one. One where her finger was sticking out her hand that merged together with her wrist this seemingly continued to happen as creeped up her arm from there. Looking at the image in the mirror it seem to mirror the replica of herself the entire arm was three jointed pieces. There was the shoulder, upper arm, and then merged forearm, wrist, and hand with her finger sticking out of it.
She wanted to move but it was already too late as what had happened to her arm had already happened enough to her legs that she could not move from where she was. Thus she was stuck in place as she was being slowly roboticized from the attack that the Healer's Association had managed to see to her directly in their attempts to control healing magic and thus unknown to them. The healer's association did not know that this process of roboticization was happening to the Ancu as they just knew it was taking control of healing magic so it answered directly to them and them alone. Since they wanted to take away the autonomy of healing magic to place it under their control instead. Ignorant of what they desire truly meant to strip the autonomy away from what governed over healing magic(actually all of White Magic itself) was an attempt to strip that from Ancu as well as her free will and thoughts. As she was the source of all magic that fell under White Magic of which healing magic while a large portion was only a fraction of what she truly governed over.