You could take out smaller chunks over a few years. See what she is short on money for her wedding after she has paid deposits and figured her budget or offer to pay for the cake, dress etc. you don’t have to pay for the entire thing and don’t let her think you are going to !
Dude, put that money into a Roth IRA or something like that, slap a trust on it, so she can’t get it until she is like 60 years old, and invest it in a fund that mirrors the S&P 500. Or, tell her to borrow the money for her wedding, so she’ll have some skin in the game. She can take out a loan for her wedding, but their are no loans for retirement.