My friend and I are drifting apart. I'm not sure what to do?

[Marykate]

We are in high school and we've been friends for 3 1/2 years now. It's been me, her, and two other girls since the beginning. She is the kind of person that chooses a new best friend every 2 months or so, and currently has one outside of the 4 of us, that's fine. She acts drunk as soon as she's had a drop of beer( I know everyone has a different tolerance to alcohol but I'm talking about one sip and shes acting like a fool), so I told her to calm down and stop acting like shes drunk because it's not fun for everyone else and she yelled at me and said " well what do you know". So now, we don't really talk and she's written sarcastic things about our friend group on twitter, one was about me. She tweets that we are never there for her, but she's never there for us either, I've been having trouble with someone in school that everyone knows about and she hasn't even tried to console me or comfort me. Can I do anything to mend the friendship or should I not be friends with her anymore?

[Mangajiji]

Look friendship is hard and it is first of all do you want to tolerate how she is acting with you. That's the first thing to find the answer. Also do you think its just a phase maybe many things are happening in our life's right now right so calm down maybe something is happening in her house. And tell her that the beer thing is not funny at all, and if she has now turned into someone mean ignore her ok if she doesn't want to be your friend anymore so be it don't show her your emotions that's what happened with my friend and i we were best friends then one day she started to change i still wanted to be her friend then when she was down she used me as power up friend to use only so ya. Its ok try but don't seem like an idiot with her like i did with mine. try if it doesn't work you will find a better friend who could actually your best friend more than that girl. Hope you feel better and hope you can fix your friendship.