I agree with Robin - your aunt needs to accept that your cat is part of your family. If she wants you to live there and help her out, then the cat is part of the deal Otherwise, she needs to find someone else to stay with her.
When I was younger, my grandmother (who had Alzheimer's) moved in with us. She did not like the idea of my cat living indoors. I had babies at the time and she kept telling me that the cat would steal their breath. She would try and pick Atlas up anytime she saw him to attempt to throw him outside. He was a smart cat and learned to avoid being around her.
