My choices: Pitt if she wants a larger school. With Pitt’s size, she shouldn’t worry about running into high school classmates.
Connecticut College or Franklin & Marshall if she wants a smaller school. F&M would be the warmest/sunniest (other than Charleston, which I don’t think would be a good fit), and the closest to home if she needs to get away for a few hours, a day, or a weekend.
For someone with SAD, I would avoid Rochester. I am a south central PA native and lived in gray, snowy, cold upstate western New York for 4 years. Most depressing 4 years of my (long) life. I don’t know if Skidmore’s weather would be similar but it’s also pretty far north.
If you would need to borrow money for her to attend the more expensive schools, then finances need to be a major consideration.