I agree with Sally. On top of that, the ribbon would really clash with your beautiful quilt design. I would go with either a realistic filler or a traditional fill. The moose is just adorable. Anyone would love that quilt & with the holidays coming up, it would make a great gift for a man, woman or child.
If you want to add a nod to the Breast Cancer Foundation, maybe you could print/embroider a small pink ribbon on the label & reference that it's a raffle quilt. Anything more than that would likely severely limit the number of potential bidders & I'd really love to see you get top dollar for your daughter-in-law (and I hope she makes a full recovery).