You've gotta take a little more control of the friendship. Right now she's (with the help of her friend) dictating the terms. She needs to be honest with her parents before anything could go further between you two. Right now it doesn't look good for the two of you. Call some shots and see how she responds to them if she doesn't agree to any then she's probably going to walk all over you if anything were to happen.
$5000 is a pretty good head start to move out and possibly move to another state if you want to start fresh. It's a bit cliche' but, there's plenty of other fish in the sea. Just be yourself and go with your gut instinct mate. I hope it all works out for you.