re: Complicated situation. Advice appreciated. Will try to be brief.

Tell her that she can absolutely go out there, but to just give you a head's up on if and when she will be going. Probably talk to her a little bit, ask how everything had been going, and basically get closer to her so she will feel comfortable talking to you. More trust will be built that way, and it'll benefit both of yall. It probably won't work, but try and steer her in a better direction. Get her a new job, help her find a place to stay, get new phone #, etc

Doesn't sound like you mind her being there so much, but it does sound like you're worried what will happen to your stuff when her BF gets out of jail.