She is a quilter. She may go after what she needs for quilting. If you have done all this for her, you will not step in her way when she needs/wants something pertaining to her passion.
So, the gift could be something that has nothing to do with sewing (except the gift card to her favorite LQS-we would all love that!). Dinner, picnic, etc. are all excellent ideas.
My suggestion is (if she doesn't already have one) a 3-stone diamond ring. For your past, for your present, and for your future. Hopefully size won't matter to her. (More money for fabric...) With us, it is the meaning of the gift.
And always surprise her with your support in her quilting.