Ultimatum!!

[Chojin]

'We were just saying that our sensory inputs have become acclimated to your biological signature.'
'I see. I am fond of you as well, Commander.'

Yeah, it isn't easy at all and there's a good shot she knows you're feeling bad and won't hesitate to beat up on your conscience until you begrudgingly let her stay if she promises FOR REAL THIS TIME OKAY NO FOOLING AROUND to follow the rules of the house. Which she'll do for a week or so.

Most people are shit and will abuse you if you let them. Your best bet is to be mock-helpful by giving her really interesting articles on cheap apartment fares.