another option might be get a really late lunch seating...we did that for sci fi pre fantasmic( 3:55= lunch 4:00=dinner there but know the times are different for different rests.) and were told by a cast member the time in the computer for your PS is the meal you have so with us even if we get seated at 4:30 it is still "lunch". (I was concerned cause we are using a vkl voucher) menu applies too so you could get what you want .
if you want to go later I would call the rest. ahead of time to ask if her heart is set on it cause I notice the price is less at lunch.I wonder about them being willing to let you get a less expensive item unless maybe they will since it is just for one in your party. no one ever seems to mind if you want to spend "more"!