I considered doing this since our Ally savings account is now paying 4.2% interest but then I'd have to declare the interest as income. They are in a lower tax bracket than we are. Maybe that's a moot point.
OP, I would have a good sit down with your dd to talk about future goals and budgeting. I've never used it, but a lot of people on the Dis talk about the YNAB app, (You Need A Budget) to help see where money goes. Maybe, in her mind, finishing college and getting a real job has been a goal for so long and now that it's done she can coast for a while and focus on having fun. I did that too in my 20s. Then after a year, my parents started charging me rent, $400/month in 1992. I was so mad and said, "For $500, I could have a whole apartment!" So I moved out.
Anyway, my point is, just because one huge goal is finished, doesn't mean there's no need to set future goals.
Hopefully she is saving a good amount toward retirement. The hospital where I work used to offer a pension but in the early 90s they also offered a tax-sheltered annuity. I was trying to calculate how much to put in per pay so I asked, How much would my pension be worth? They couldn't even give an estimate. They just say there are many variables. I said, Will it even pay my cable bill when I'm retired? No answers.

Worthless as teets on a bull.
So I started saving with their tsa and when they eventually switched from pension to 403b, the funds all merged together.
Dh didn't start retirement accounts until after we were married; my account has a LOT more than his. Not quite double, but close to it. He saves 3x what I do and will never catch up. Time is on her side. Hopefully she understands that.