Everybody has choices to make in life. Your daughter has chosen to party and goof off instead of taking college seriously. And lost a scholarship as a result of it. It would be foolish to reward that with an all expenses paid trip for her to
Disneyland. Plus, if you are paying any $$ of your own toward her college education, that is all the more reason not to pay for her Disneyland vacation given the current circumstances. I think that the "but it's a family trip and she might feel bad if she can't go" is not a good enough reason.
If you really feel strongly about the "it's a family trip" side of it, then figure out a way to pay yourself for her to go with you...or nobody goes on the trip. Because if you take the "But it's a family trip!" logic one step further, then if the entire family doesn't go, then nobody should go, correct?