Yes - cast members generally get a 40% discount on resorts. During the holidays, they could get as much as 65% off resort room reservations (block-out dates apply).
Plus, your daughter would get 6 maingate passes for family and friends during the program would which get up to 3 people in for free per day. She has to accompany her guests in the park, however.
So yes, a Disney vacation
can be affordable.

Just have to do lots of planning!