I’d be freaking out, but my kid has anxiety and sleep issues. I second or third the recommendation not to bring a fridge. My daughter never used one until her senior year, when she was actually cooking for herself, and in that case, the school provided it. Her first year roommate brought one for them to share, and they stored their gummy vites in it. Yes, that was it. If your d is on a full meal plan, she doesn’t need a fridge.
The main thing is that all the girls in your daughter’s room have to realize that they are living in a barracks. They can’t be entitled, spoiled or selfish. They have to agree from the start to have certain quiet hours and lights out hours. And the pot dealer needs to just keep her habits out of the common space.