Your grad already has your old smart TV in her bedroom, but she's annoyed that she can't watch all her favorite shows on there because it doesn't have a good YouTube app. The Roku Stick does, along with thousands of other apps.
If your grad has a bunch of stuff on iTunes, or she just wants something that looks and feels a lot like her iPhone, the new Apple TV is just the ticket. In addition to numerous TV apps it also works with many of the games and other apps she might already own.
Maybe your grad is grown up enough now to appreciate and deserve a big TV. Our current favorite for the money is the excellent M series, a 4K model with a great picture and a wide range of sizes to choose from, starting at 43 inches.