"Great. When you return, I'd like us to create a roommate contract so that we can both be happy moving forward while living together in the apartment."

This way, your flow doesn't get automatic override and her way of living doesn't get automatic override. You will have to compromise, but you will be able to lay some reasonable boundaries down.

For example:

You don't play music on a speaker in shared spaces. You will have to decide if the bathroom is a shared space.

She doesn't touch or move your private property (this is unacceptable, btw, and I would have laid down some rules about this far earlier than now).

If she's unable to compromise, you suck it up and move out when the lease is up.