Girl who never called back still on my facebook?

In short me and this girl had a night together ending up sleeping together and talked on the phone blah blah.she is a friends of the family well I tried calling her one day and left voicemail but never called back. My question is she is still friends with me on facebook and sometimes when I put up a post she likes my status even tough she never called back she still has pictures of us together. I know now that some people tell me she had problems with her cell but who knows. Is out weird that even tough she never called back she hasn't removed me from her facebook and liking my status.maybe I shouldn't worry about it but makes me think maybe her phone wasnt really working. What is your opinion people?