What can be going on??

So me & my fiancés roommate brought some girl in our apartment to stay with us. We wanted her gone by May but she doesn't know that because we haven't told her. Well on March 14 she left with her ex to the mall and never came back only at night to get something. We texted her and called her and she never answered us. All her shit is here her clothes, her feminine stuff like tampons and shampoo ever her tablet. She called our roommate about 2 days ago. She said "what happened" he told her that we thought she went missing or some shit when you coming back. She litteraly changed the subject and said "oh whats that girls name that came over with you last time with the blonde hair". And he told her I don't know anyone with blonde hair so he told her again when you coming back. She said real quick "oh my phones dead I got to go". What can be going on we are wondering why she asked that and why she hasn't came to get her stuff since it looks like she found somewhere else. Sorry if its confusing any guesses of what can be going on???