I raced for a school in Thompson (same as WPI) ages ago. Unless things have changed significantly, in each school's race day roster, there will be a vast range of experience from very strong academy kids to people who've never been part of a race program before. The Eastern Conference has four divisions--McConnell is the strongest with a few varsity programs, and McConnell a step below that with all club teams. My team generally had about 6-7 spots on the roster for each gender more or less set for the season, filled with the more experienced racers, and then rotated people who were newer to racing through the bottom of the roster. Course sets were no different than the USSA sets I was coming from. This was before the age of tweeners (and helmets in tech!) but I think those would be perfect for someone who hasn't been racing for a while. One thing your daughter likely won't see a lot of is training time, so I'd recommend she get out there and free ski on the tweeners as much as she can.
USCSA is ridiculously fun. We occasionally drank beer.