Sevensong,

I think you're actually handling it quite well. You've determined you don't have the energy to deal with this person, so you've figured out how to be away from her as much as possible during the next month. A lock on your door is a great idea, and shouldn't be hard to do. You can actually install it yourself if you can handle a screw driver. Maybe for the next month remove all the valuable things from your home and store them at your alternate dwelling so she doesn't have the opportunity to get to them?

Since you're only going to go back to pick up stuff, can you bring someone with you whenever you need to go and get stuff? That way there is a buffer between you and her and you don't get caught alone with her?

Look at this way, it's only a month, only 4 weeks and then you have the place to yourself again. Try to enjoy your vacation away from her in the alternate space and enjoy the peace and quiet rather than get worked up from your anger at her.

I think you've taken almost all the steps you need to until you're free from her. A lock on the bedroom door would be the best next step.

Good luck.
Seesaw