[ Friends ] Open Question : is she really a good friend? i don't think so.?

there's this girl in school with me that is nice with me but always used to ignore me and not talk to only me every couple of weeks. i asked her why, and she said "cause i'm in a bad mood," but that's ridiculous. bad mood with only ME? and not with everyone else? i don't do or say anything bad to her, she just does it. and she came to my house for a sleepover last month and we swam, eat, drank and slept. and she hasn't talked to me much on the phone ever since. she never puts my name on facebook in her info, and puts all of her other friends. now i realize she just wanted to be my friend so she can come have a sleepover at my house. so she isn't a friend right?