Best Friend Advice help!!?

So I had this girl I was friends with. Before, when we were friend she acted funny. Like she never wanted to come to my house because it was too much of a hle. She had to convince her mother, and was to lazy to take her stuff over here, and she would often say "whats the point?" if i wanted to sleep over at her house she would say no because it would mean she would have to clean her room. she never wanted 656 hang out saturdays, or sundays mostly because she was too lazy. she is also chronicaly late for everything, school, movies church. i kind of tolertaed this for a while because i did not have a lot of other friends. as i made more and more friends i realized i don't like her that much. we got to go on a school trip togethor where she was her typical lazy self, freaked out about not having enough outfits to wear, did not want to do anything or go anywhere, and while we were in conferences she just doodled song lyrics all over her notebook. she is obsessed with her hair, always playing with it and stuff. after the DC trip i was so mad about all the **** that happened i kind of stopped talking to her. she made no effort to rekindle our friendship despite the fact we had been best friends for a year? i do not know what to make of this. i know you might be thinking based on how she acted we were never friends but we were. she acts towards all her friends as she does me. the best part is when people are mean to me in front of her she does nothing, and will not agree with me they are mean. she goes "yeah they are mean to you but that does not affect me" am i wrong for disliking this girl now? i tried to brainstorm some possible reasons she acts the ways she does but i really do not know. she also is much poorer then most of the girls at my school....is this possibly why????????? please help me with what is wrong with her???