Patients, and I believe that would include those in a care facility, are frequently difficult to deal with. They're in pain, not in control of their environments, and depend on others. It's not abnormal for them to be complete jerks. This person needs to have their pain seen to, and would benefit from having some control.

That's not up to you, though, and the staff should deal with it. Or you might be more effective if you were to be a little bit of a jerk yourself. In other words, don't try to suppress your own reactions.

Somebody up there said you should wonder why they put her in with you. While I think it was probably meant to be snotty, it may be a good question. Is she there because the staff believes you're tolerant enough to put up with this terrible situation? You aren't the care-giver.