She had done what she had done in the past, which was that she had gotten off at one stop to go for a quick clothing alteration before getting on another.
A couple of detours and switching of the subways she took would create confusion for anyone who would be trying to follow her movements if they did happen to catch on to her being involved in the crime she had committed.
She had done those things habitually as she was wary of being caught and having her life fall apart.
Others would not be so cautious, and they would let their guard down the moment that they believed they had gotten away with what they had done.
All that it took was for the police to ask for any information that could be given by the public to aid them in their investigation, for one person to call in with something that they found suspicious.
