From all the things you have done for her, your intentions are pretty obvious and I bet she knows it too.
She probably has feelings for you but just not ready to accept you yet. Obviously she still has feelings for her ex and clinging to the hope that they might reconcile one day. Her emotions are still very unsettled and she is not able to make rational decisions on relationships.

Come clean with her if you intend to move more slowly from now on. Tell her that you will give her some time to clear her mind and you will contact her less.
Do not play the guessing game and disappear out of the picture suddenly. A lot of misunderstandings will arise and many opportunities will be lost.

Keep in touch with her situation but at the same time keep a distance from her.
If she starts to miss you during your reduced presence, then it is a good sign.
But if her feelings for you fades, then she probably isn't much into you in the first place.

When you feel the time is right and her emotions are more stable, make your move again.
The situation is not lost. Just be patient and do not force her to make decisions now.

I wish you all the best.