At 14 you don't have a big runway (4 years ) before college so you are not going to have a lot of gain anyway. 529's can also be used for a future spouse or future children for private school tuition as well as college and trade school. With a 529 only the gains are subject to a 10% penalty and taxes if the money is used for something other than qualified edjucation expenses.
I'm with
@Cookie on this one. I would just open a Vangaurd account and get a low cost index fund like VTSAX total market or VFIAX S&P 500. Keep in mind you end up with $40,000 in 4 years or you could end up with $60,000
If you really just want to preserve the money a CD would better than a savings account.
As for being able to stretch $50,000.00 for college ?
1) live at home 2 years JC and 2 years a Universtiy , no problem.
2) live away at school in state 1 1/2 years if you are lucky.
3) Go out of state or attend a private college, one year if you are lucky.
Having already funded options 1 & 2 I would beg you to choose number #1
Good luck deciding and what a cool blessing to recieve the $50K