I know how hard that is, and i would love to help. Here's what i say:
1. If that girl is really taking away your friends, making up stories, and being mean to you, maybe you should talk with her. I wouldn't be mean about it, just tell her what you feel and if she just continues to do it, talk to an adult and ask for their help.
2. If your BFF was actually your BFF, she would not ditch you because of some girl. Explain to her what is happening, and that you really don't want to fight and you just want to be friends again. If she just ignored you then she isn't a real friend.
I hope this helped! And i hope you feel better :3
~I do not produce signatures~
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~"Love is always patient and kind. It is never jelous. Love is never boastful or concieted. It is never rude or selfish. It does not take offense and it is not resentful." -1 Cornithians 13:4