And someone else with the username u/lapsteelguitar shined a light on another issue.

“Two separate issues in my mind.

She invited herself. Reason enough to say no.

If she won’t take care of herself, and won’t clean up after herself, reason enough to say no.

Together, not a chance would I let her stay in my house.”

Source: https://www.buzzfeed.com/jenniferadams2/aita-period-thanksgiving