In terms of general academics, it may not make sense to make a significantly larger investment for Smith. In terms of specific programs, MHC may fit her interests better. Both schools have Dance and PoliSci departments (actually “Politics” at MHC and “Government” at Smith). However, MHC also has an “International Relations” department and major, which Smith lacks (although students at both schools can pursue the “Five College IR Certificate”).
Some people might be willing to spend more for the setting of Smith. Smith is located in the small but lively city of Northampton. As per Wikipedia, Northampton is “known as an academic, artistic, musical, and countercultural hub” featuring “a large politically liberal community along with numerous alternative health and intellectual organizations”.
In contrast, Mt. Holyoke is located in South Hadley, a less urban community which isn’t really a “hub” for anything. There is a small shopping center across the street from MHC, and not very much else within walking distance. Of course, some people might prefer the more rural setting of MHC; for example, they have an amazing equestrian center and great riding opportunities.