If her choices are ISU or LCSC, I'd just look for other programs that honor WUE. Lewiston is sort of the "banana belt" of Idaho because of its elevation, and tends to stay warmer than anywhere else in the state. However, Lewiston is a dive. Seriously. It's very remote, and while it offers great access to outdoor recreation, the town itself is rather boring and it stinks there (really...it does). For any sort of recreation most kids head to Moscow, but that's no metropolitan either.
ISU is in Pocatello, and frankly, it's a dismal place to be in the winter. Eastern Idaho is gorgoeous in the fall, but it gets really windy, grey, and dirty in the winter. If you can escape south or north into the mountains it's a blast, but like someone said, once you get crunching in school it's hard to escape. Good recreation there, though. I'm just not the biggest fan of Pocatello. Much better college town than Lewiston.
Boise is by far the best choice: skiing (night skiing even) is but 20 minutes from town, the weather is generally nice all year, exciting, dynamic town, great college scene, great outdoor recreation.
If you can do WUE with Montana State (Bozeman) or University of Montana (Missoula), I'd definitely look at going there.