It's a tough one. I think it depends on the childs maturity level. In this situation, I'd probably say fine, but dad can pay for credit.

If she's been good, and has been pestering for years, I figure it can't really hurt for her to have it. Sure, she doesn't need it..... but letting her have it doesn't mean you're changing your beliefs. Just allowing her to do her thing, despite what you would prefer. It's not like it's a rifle....