How old is the child? If she's young, get her a gift card to Toys R Us or other toy chain.
Mom won't be able to spend the childs monies if it's to a toys only store.
Savings bonds are cool, but a child won't understand that. My dad gets my kids one each month, but he keeps ahold of them. They don't even know what a savings bond is...til they get them as adults.
Why haven't you seen your daughter? Are there papers in court that specify parenting time????