You don't say how old your daughter is. The dining plan is only around $11 a day for children 9 and under.
I don't know any way around the everybody in a room must be on the same package requirement, but maybe someone else does.
However, just a few ideas if you have to buy the dining plan for your daughter and she is over age 9:
- use 'her' credits towards signature restaurants that require 2 credits per meal
- take in one the dinner shows that require 2 credits
- enjoy a character breakfast (don't HAVE to be kids to enjoy that ) and still have credits for a sit-down dinner
Over the course of 8 days, with a little planning you could stretch those credits out so you'd have some great dining experiences, not just use them as a third meal in the same restaurant.