[Solumina]

You could ask her to feed the cat in her room since that seems to be a big part of the problem and I cannot see how it would be something that she would object, as long as it is asked nicely (ie. hey I would really rather not have to maneuver around your cat's food when I do my laundry, do you think you could move his feeding area into your room?).

That and maybe you could talk to her about how the kittie's waste should be taken care of right away because that is unhealthy, again I stress that tact is key, you don't want her to feel like you have a problem with her or the cat or else she will just get resentful and defensive.

I hope things work out well for all of you