Welcome Dad!
Being Jewish you are at somewhat of an advantage. It's been instilled in you to question "truth" and outside of orthodoxy your heart is usually wide open. But you should also question anything instilled in you because there is no specific journey towards the future you can take that will give you more than the life you lead now.
You are expressing it in your words already. Embrace unconditional love. There is nothing better you can ever experience in your short time on earth.
Keep your love and admiration for her healthy. It will be hard to let go when she forges ahead on her own path.
Thank you for sharing your touching story. Thank you for loving a young ex-JW.