Or it could be that she is trying to move beyond the treatment centre and do some rebuilding. There are a few reasons for this that come to mind. One being that she might be embarrassed or otherwise feel the need to distance herself from this event in her life. Friendships associated with it may not bring her positive memories or emotions. Her time there might have been too difficult to remember hence she is trying to remove the memories. It is likely that she simply wants and needs to move on.

I want you to consider how being in such a vulnerable state affects us socially. We make friendships in such situations and places for different reasons than we do away from them. Friendships and relationships within mental health institutions in my observance abound. We have a term for it in my support group referring to some of the relationships as institutionalised friendships (and for some institutionalised romances). I think it is perfectly normal that these acquaintanceships fail or are even ignored on the outside.

Do not take this personally. What I am trying to say is that this is absolutely normal. Concentrate then on those relationships that are actually proving to be solid and good for you.