Someone once asked...

“I have a toxic best friend and I'm still too scared to confront her so this weekend I'm having a sleepover with her but I don't rlly want to.”

Someone answered with kindness...

Just say you don't wanna go. If they really are a "friend" (toxic or not) they will understand and not be too nosey. However, you should tell them how you feel and maybe they didn't realize that they were acting that way. always be comfortable to express yourself and don't worry this isn't the end of the world, there are other (less toxic) people out there.