Might not be a full on red flag but it's immature as hell.

Isolating people from their friends/family/support-system is the foundation of every toxic relationship.

Not overreacting, it could be a red flag. I would say your feelings and thoughts definitely are valid, but give her the benefit of the doubt and also ask what's going on, don't make false accusations. Break up with her if she turns out to be bullying your friend and/or making you choose between her or him as an ultimatum.

She should be able to express not wanting to hang out with given friends of yours in a safe and constructive way.

I have friends my wife doesn't like, i have friends my wife absolutely adores. In both cases clear boundaries and respect for the fact that these are my friends were made.

do you have many friends? if so is this one closer than others? Its a red flag if she is trying to mess with your support system which is something some people do. well and cults.

Hiii. That sounds so rough :(

I'm glad you're giving her the benefit of the doubt, but you should be able to talk to her if this continues if she is a nice person. Her behavior is a reflection of her, not you or your friend.

This is a tough one. If you have friends that have been with you through thick and thin and she didn't like them, tough!

If other friends are maybe a little more like acquaintances, maybe the spouse of a friend you like so you tolerate them, then no big deal, but I think she needs to deal with them in a mature manner.

We’ll sort things out :) We will discuss boundaries and it’s ok for her to not like all my friends, i will eventually ask her mot to bully him if it comes to that though