Colorado Requirements for Residency:
Own or operate a business in Colorado
Are gainfully employed in Colorado
Reside in Colorado for 90 consecutive days
It looks as if she becomes a resident as soon as she takes the job, although 90 days' physical presence will also serve. I'd be grateful for correction by any Colorado FReeper who knows different.
So, probably best for her to purchase it there once she picks up her driver's license.
It is easier to register to vote in several counties in Colorado than to get a drivers license.