I agree with your boundary. If she wants, she can stay somewhere else and come in and out of the house as she wishes. But you stay put!
Yes stay put but I'm not sure how much I agree on coming & going as she pleases, I would tell her, if you're going to come by, please call before just to see if we're home first.
Because if you allow coming & going as she pleases, you'll get that x 100.
