Xu Huo didn't make detailed arrangements for the Girl in the painting, but he had two strict requirements: One, no one can leave the base, and two, no one can approach the meeting room.
Preventing anyone from leaving the base was simple. With all the major entry and exit gates of the base shut, essentially no one could leave unless they were a player. Forget about bringing people out—thanks to the government for building the R1 Base so well.
Preventing anyone from approaching the meeting room required some skill.
The Girl in the painting found it inconvenient to move in human form, so she used the monitoring system to instruct staff near the safety doors to shut them securely. In rare cases where there was non-cooperation or a lack of people to cooperate, she simply filled the passage with Flying Paper to prevent anyone from approaching.
