
The only way something like that could be illegal is if someone is deathly allergic and you purposefully expose them to the pet and withhold medical care. So the only solution here is the landlord deny the pet (assuming it can be in accordance with the lease), or everyone moves out.
She shouldn’t lock a cat in a room all day. Hence why having a cat in an apartment with allergies isn’t feasible. She should consider moving out if she’s going to keep a cat (which in general I’m anti college age people with pets. They don’t have the time or the money to be a responsible pet owner in a majority of situations)
atp i feel bad for the cat☹️ she’s had it since february, however she has been moving the cat from friends/families homes since march and has not had it under her care since, idk why she thought getting one in the first place was a good idea if she couldn’t provide a stable home for it