I would strongly advise your daughter not to apply to St. Lawrence given the information you shared. I am similar to how you described her (also a girl) and ended up transferring after my freshman year because I was so unhappy.
SLU is definitely very cliquey, with cliques based on sports teams, Greek Life and theme houses (though you cannot join either until Sophomore year), and feeder high schools (both prep schools and certain public schools from CT, MA, and also the nearby towns around SLU). As a freshman, if you are not on a sports team or from one of these high schools, it is VERY difficult to make friends. Ironically, I think if freshmen could join Greek Life in their second semester, it would help a lot. Some freshmen do make strong connections within their FYP, but this was not the case for me or my friends who I eventually did meet through other classes, but it was difficult to find them.
Additionally, the social life STRONGLY centers around partying, both drinking and smoking. There are barely any weekend activities that don’t center around parties, especially since the town itself is so small, so options are very limited.
For what it’s worth, I did enjoy my professors and classes, and the campus itself is definitely nice. I initially wanted to go to SLU for the same reason as your daughter, as I was really interested in Small Liberal Arts Colleges in remote areas.
My DMs are open if you or your daughter have any other questions about my experience - I’d be more than happy to connect!