She needs to look into the residency-for-tuition-purposes rules in both New York and Colorado to see where he may get in-state tuition. Best case (unlikely), he may be eligible for both states; worst case is that he may lose eligibility in the state they are living but need to wait a year or so before becoming eligible (or not even be able to gain eligibility if he starts college classified as a non-resident) in the new state.
https://www.suny.edu/smarttrack/residency/
http://highered.colorado.gov/finance/residency/regulations.html