Make A Wish has specific medical criteria regarding who receives a wish, and doctors must complete paperwork.
Make A Wish Eligibility Form.
Some of the comments under the linked pieces, ie thinking of this trip may have helped pull her through treatment, and the mom whose daughter was in remission from leukemia then died, make good points, IMO.
Another bit from dad:
link
The foundation already approved her. It costs dad nothing. Seems very petty and mean spirited not to let his little girl, whose memories to date probably mainly consist of needles, pain, and sickness, go have a gleeful time now that she's well enough to go.
Moo