Pray about every detail of the conversation and pray it often.
I’d give it a week of prayer before you make the first contact about it.
Next, as much as it is possible, do this face-to-face.
There's simply no better way to make sure the message you have in your head and heart gets communicated as clearly as possible. This is something that requires the whole person — facial expressions, body language, voice inflections — you get the point.
Whenever we talked, though, I was overjoyed with her faithfulness in God, and it spurred me on to pursue God even harder.
Meanwhile I’d give her lots of space to reduce whatever awkwardness there might be when all three of you are in the same location.
After a few weeks or a month, I’d check back in with her to see where she is (if she hasn’t already gotten back to you) and move ahead accordingly.
Either way, you’ve done all you know to do, and you can be at peace with that.
The rest will unfold in short order, and you can put all your trust in a good God who loves you (and her) deeply and will do you both good.