That sucks
This bothers me "out that
six people I barely know went into my bedroom without permission and went through every single one of my drawers"
I wouldn't want to be there if I were her. My first thought is that she needs to move out for her.
However
"If the other roommates were to move out, Leyla would need to find roommates to share the place or foot the entire $6000+ monthly rent herself," Lewis wrote in an email to Pirnie and her father. "Obviously it would be much easier for the others to stay and just fill one room (and I'm confident—were this to happen—that the remaining housemates will release Leyla from any further responsibility under the lease) and that's why I proposed what I did."
Why is she obligated for the others if they move but if she moves the owner thinks they'll release her from the obligation?
I'd make them move out and not release them from anything, she's done nothing wrong might as well put up a fight.