Was she a real friend? Should I have tried to help her? ?

I used to know this girl who would call me 7 days a week and ask me to hang out with her. She had on friend other than me and Brenda who lived in toronto and she would take the 3 hour ttc to and from her house to her friend's every single day, when this other girl's boyfreind dumped her. My friend would call her house 6 times a day and ask her if she was okey. She did this not because she cares about Brenda getting dumped by her boyfriend but because she thought if she was really nice to Brenda, brenda would be her friend later on and then she'd have one more person to hang out with. She would distort things that I told her to make me look bad in front of other people, and would celebrate both mine and other people's personal failures.... at least it seem that way. For example, I know a guy who tries REALLY hard to be a good chrisitan but he struggles with ual immorality. She made a mockery of him to everyone and tallked about how full of **** he was. If someone called her out on disrespecting them, she would slander them and say evil things about them. What I don't understand is why is that after she got a boyfriend she made a point of including me on 80% of the outings that she went with him, and including me on EVERY single outing that she went on with her other acquintences, why she wanted to hang out with me every single day. Was she a pathetic little girl who wanted to find love and friendship when she knew she was not a genuinely good person? My question is did she choose to be a bad person or was it because she had no control over who she was and how she acted? I've always beliefed that non-christians do not have the ability to get rid of the sin in their life, even if they wanted to. I feel sorry for her and I kind of miss her now... but we will never be friends again. This is because I told her boyfriend about how she was treating me and he dumped her for being a two faced ****** who gives gifts to the rich and oppresses the poor.