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I really do think you should communicate with her about this and let her know how you feel. I know that it may be hard, but honesty and communication are key in any relationship, so you should let her know that you understand why she is not coming out right now, but you have concerns and feelings you have, such as accidentally slipping up in front of someone who may tell her family, and how you don't feel as if she is into you anymore.

At least if you let her know your concerns, she can either ease your mind a bit or try and find things to do to improve the current relationship the two of you have.

Of course, if nothing is going to change for a while even after you communicate with her, you'll have to think about whether you are comfortable enough or happy with staying in this relationship, or whether you'd want to move on for now.