Is she a single mom? Is the dad involved at all? If so, will he be staying in NY? I’m no expert but it might influence how residency is established and how aid would be calculated.
Should the son go to Colorado with his mom and take a gap year, he might want to look at U of Denver - it is pretty generous with aid for solid students that aren’t at the tippy top. I believe it’s Catholic but not intensely so. Colorado College is a very good LAC that is on the one course at a time plan. Regis is small, Catholic, and nurturing.
If the son seeks admission to a Colorado school at this late date, options will be limited. A later transfer to another school as a non-freshman will limit merit aid possibilities.
If money is no object, of course, then strategies would be somewhat different.