Yes I saw your post about that. Since it's a cheap alternative to the scat mat I will probably try that first. If it doesn't work - I might just cave and buy the mint / citrus spray and scat mat to place outside the door.

Your loophole is that you signed the lease with the understanding that you were getting the room with the door, therefore you were willing to accept limited exposure to the cat. The person changing their mind is yet another 'oops' on the part of the landlord. Ask to switch rooms. (It might annoy that person enough to get them to also advocate for rehoming the cat.)

I mean, this whole thing ends in 10 months, right? So can your landlord ask someone to foster the cat for that long and then welcome it back with open arms as you wave a relieved goodbye to this whole arrangement next year? Be sure to have that house meeting soon.

In my state there is a part of the tenant rights handbook that describes controlling pets: "If you are allowed to have a pet, you must maintain control over it. If you allow your pet to damage the property or interfere with the rights of other tenants, your landlord can demand that you control your pet or remove the animal from the building." I assume that the same applies to the landlord, since she is living on the premises. I would look up the laws for your own state.

The cat coming into your room at all would be a violation of the above, I believe.  (Especially taking into account your allergy.)