To find out how much is on her gift card we take off the muffins from the 14.48 on her gift card.
5 * 1.02 = 5.10 she spent on the gift card
14.48 - 5.10 = 9.38 left on her gift card
8.50 is less than 9.38, but I don't think it is unreasonable since she knows she would have that amount on her gift card. Though I would say 9 dollars would be more reasonable.