I rather doubt, too, that Amber is doing this intentionally to provoke you. After all, she was doing the same things when she was in college, before you asked her to leave your house.
I don't see that watching what she is doing on Facebook will do either one of you any good. It is upsetting and distressing to you.
She knows how to get in touch with you, as do, presumably, her friends. You can't do anything to prevent something bad happening, but people will be able to find you if it does. If it were I, I would block her on Facebook.