Break-even with Tables in Wonderland is $750 if you pay $150 for the card; $875 if paying $175.
Will you be spending $750/$875 above your dining credits - that's a substantial amount of alcohol?
Also, how much value does your prepaid DxDP provide if you know that DD eats like a bird?
Finally, if you are planning on DxDP for your daughter, you're paying for an adult portion. Unless, of course, your plan is to have only two dinners paid for using dining-credits and her meal paid out-of-pocket.
Given what you've described, I have no idea how you'd be extracting any saving from the DxDP.
Get TiW - if the math works beyond your break-even.
If DD eats like a bird, the kids steak at Le Cellier should be fine.....and discounted at 20% if using TiW.