I wouldn’t agonize over decisions until you have admits in hand.
Mount Holyoke and Smith are both part of the 5 college consortium (with UMass A, Amherst College and Hampshire College).
But, at Wellesley you can take classes at a number of other colleges. Wellesley has a rep of being relatively more of a grind academically with relatively more competition among students than does Mount Holyoke (or the other schools on your list). Many believe Smith has more SJW types relative to the others.
You didn’t say what your entire list is, or stats, but none of these schools are highly likely/safeties. Have you applied to at least one affordable safety?
Good luck.