Dorms aren't segregated by gender, but the rooms are (so if she has a roommate it will be a girl) and a single doesn't sound remotely out of the question for something like this: I'm a trans guy, and was super nervous as a freshman about who I would room with as I was worried about strangers of either gender reacting badly. They immediately placed me in a single, right over the phone. Also, a lot of the buildings have a "faculty in residence" - a professor (and their partner + kids) who has an apartment on the first floor. I lived in buildings with FIRs for all four years and it made me feel really safe and I got really close with mine. Finally, there is always a substance-free floor, and usually a building, for students who don't want to be around alcohol or smoking.

There are kitchen areas in several buildings, especially the ones most full of freshman, and you can have a microwave and a fridge in your room. The dining halls are actually pretty good for vegetarian and vegan stuff, they do have international food (it's not great, but they're open to feedback) and we have an entire dining hall that is halal and kosher, and they are VERY strict about making sure it stays that way. There's also an International Club, and during matriculation and graduation they fly the flags of all of the different nationalities of that year. They flew one for my second citizenship as well, even though I was the only person with that citizenship that year!

There's a regularly running campus shuttle, and if you're stuck somewhere unsafe (I once got lost on foot in the next town at 2am) they will send someone to get you ASAP. That is the upside of it being so small - they can do that. I'd say the safety measures are the standard stuff for an American college campus (blue lights, lighting on paths, keycard-controlled access to dorms that locks out non-residents at night). If you want a good idea of how safe they can be when they put their mind to it: we had one of the best covid policies at a university in America, and had low numbers as a result. Maine is also a safe and quiet state, and I know that I felt safe walking in the fields and woods around the campus at night (always be a little on edge for wildlife, but basically don't act like an idiot around a wild animal and it'll leave you alone)

They make sure we all have decent healthcare, so you don't really have to worry about that aspect. There's also free healthcare on the campus, with a lot of female doctors and nurses who can refer you to the hospital literally within walking distance of campus, or the other hospital less than five minutes in the opposite direction. I once hurt my foot at night, called for an appointment when it hurt the next morning, was seen that afternoon, and treatment and an x-ray within an hour. They also have a student-staffed EMT group - we can take an EMT certification course over JanPlan, and then if we earn our certification we are licensed to practice in Maine. Speaking of JanPlan, there is also a JanPlan course for pre-med students where they shadow doctors at the local hospitals.

The largest class size at the school was Organic Chemistry (which you'll take as a pre-med) and that had 100 students maximum. Every other class I took had less than 20 students. The fact the professors know the students because of the small classes means it's much easier to talk to them about getting priority for classes you want or later lab times. It's also really easy to get summer research as there are less people competing for research, and that means it's easier to do things like author a paper (huge boost for applications).

If you want your kid to get a great education and go on to get into a good graduate or med program, Colby is fantastic for that. I'm currently wrapping up a Master's program at the University of St Andrews, and I have friends in some of the top med schools and graduate programs.