You're going through much of the same things I did, Steph.
You ask the question what do you do next?
I still think you just keep on doing what you're doing. There's just no way to speed things up, Steph.
You hypothesize that she’s worried about hurting you. I suspect you’re right, and that personally, she’s worried about the guilt she’d feel about giving you “false” hope.
There isn’t a thing you can do or say to assure her that she won’t (or shouldn’t) feel guilty, Steph, so IMHO, all you can really do is wait it out until she feels relatively comfortable that she won’t want out.