I think my friend will falsely accuse another friend of rape
Do you think she has a pattern of doing things like this?
She's known to lie about certain things.
I think you need to keep an eye on this friend of yours.  If she tries to do something that serious, you need to call her out on it.  Nothing says you need to like everything about a friend.
I'm really confused on what to do. I don't want to get involved in this drama.
It's important that you do in this case. It could stop someone from going to jail for a long time. Think if it was you, wouldn't you want someone to make sure you weren't falsely accused?