I'm sorry for your pain. I can't even imagine.
My 2 cents- start with you and her- no religion, no tablets, no nothing. Tell her how much she means to you, how much you want to be together, etc. Be romantic and try to woo her like before you were dating. But be honest and let her know that your love is independent of the jws. And you cannot be dishonest with yourself about how you feel about them.
Try to connect with her on a human level without all of the cult overhead.
Or open the safe deposit box...
Sorry again for your pain. And forgive me for assuming anything. I'm sure you've tried everything.