As someone who has lived in both Idaho and Utah while hunting both states I can say that what she does for residency matters.
I haven't had a multi-year license in Utah, but with an Idaho multi-year license you are required to let the Idaho Fish and Game know if you move, especially if you move out of state. If she changes residency for the purpose of getting in-state tuition or anything of that sort then she will no longer be a resident of Utah and not eligible for a resident license. I'm not saying that she couldn't have a resident license and just apply for points and be fine, but legally that is what you are dealing with. Lifetime licenses still require that you notify them immediately if you move out of state. You don't have to pay for a new license, but they do issue you a non-resident or resident lifetime license accordingly.
Trix isn't necessarily right. If you change residency for ANY reason, not just for buying hunting licenses, then you no longer qualify for a resident hunting license in your previous state. College is a little different situation, especially if the student is still living at home during the summers and never taking up an official residence in another state. If that is the case then as long as the student never claims ANY residency privileges in the other state they can maintain their Utah residency.
I was prompted to research this a lot further as I had a friend who moved from Idaho to Utah for a brief time and had some issues. He lived in Idaho still for part of the year for work. He still had an Idaho driver's license, and never bought a hunting or fishing license in Utah. He got a resident Idaho hunting license to put in for the hunts each year he was in Utah. Yet a couple years down the road the IF&G show up at his work to arrest him. He ended up paying $8000 in fines and lost hunting privileges for 5 years. Never even killed an animal in Idaho in those years. He wasn't trying to avoid the law, he just didn't know the law. I still wonder why he got punished worse than convicted poachers, but that's a different topic all together.
If it was me I'd just buy a nonresident license and use it to apply for the bonus points. You can use a one year license for two application periods if you do it right and nonresident licenses in Utah are cheap. If she's living with you during the summers, then don't worry about it, but if she is moving there to live there, then just get the nonresident license and she'll for sure be good. No reason to push it. A lot of risk for saving a few dollars.