child files tax return- still a dependent?

If my daughter files a tax return am I still eligible to write her off as a dependent on my tax forms? She will be 14 next year and I am thinking of gifting her some money to invest for over five years so that she will be able to pay taxes of 8% capital gain. Does she have to pay regular taxes on the amount I gift or is the money not taxed until it is withdrawn in five years?

I'd appreciate any help!