It was a beautiful story. I don't think there was any cruelty involved other than the "god" who would allow such medical horror to exist in such a beautiful creature. I don't thing anyone was trying to trick Her. I think the adults all had good intentions and I believe the little girl had some wonderful memories that (maybe?) She can treasure for years to come.

The thing is, the little girl knew that Her end was close and She wanted to experience an adult thing before Her end actually did arrive.

If She had wanted a chocolate ice cream, would you have given some to Her even knowing that it would not "stay down"?