No judging from me, Shinamae. You’ve made a mistake, which you’ve acknowledged. None of us is perfect.
Don’t be hard on yourself. We’re not all familiar with the way things are paid for during games, and that applies to adults as well as children. I have occasionally played a game with my grandsons on my phone (before I’m jumped on as well, it was with the full knowledge and consent of their parents) and have seen how easy it would be to click on something that you’re immediately charged for.
I think I can say with certainty that if I or anyone else had been kind enough to buy an iPad for any of my DGS, their parents would have seen it as their responsibility to check that all the necessary controls were in place. They’d be annoyed with themselves in these circumstance, certainly not with the donor.
I hope you can get your money back.