How to make an unwanted visitor leave (and not come back)

I live under my mother's house. Sometime recently her sister, my aunt, sold her house. She lives a few hours away now. When she was selling the house, she stayed over and slept on our couch for 5 days. Ok, that's fine. She needed someplace to stay while everything was getting ready. She was visiting way to often, and having her leave for good would be worth it.

She came back, though, and her normal day visit turned into 7 days sleeping over. Seven days of taking care of her feral dog (of witch I'm allergic) Seven days of her snacking on the couch. Seven days of her obnoxious baby talk, her organic fruit juice, indecisiveness, and her all around burdensome self.

She's back for the third time. At this point she expects to stay over for days, she expect us to walk her dog, and expects us to feed her dinner. She's currently in the living room with Jimmy Fallon playing on her phone with the volume all the way up. It's been 4 days. My parents were trying to shoo her out today, but she's managed to curl up and stay for the night.

What can I do to make her leave sooner, and not come back?