Good luck. It’s a beautiful college & you will love exploring Boston.
Good luck to you!
“Michigan will be there for grad school…”
delawaregurl, you only get to go to college once. You will not connect with your graduate school the way you will connect with your college. 
That being said, Wellesley is an exceptional college, and obviously a better fit for you. You can never go wrong when you go with fit, and you definitely cannot go wrong with Wellesley.
@delawaregurl, I attended a LAC a bit smaller than Wellesley for undergrad and a large university for grad school and I always felt like I had the best of both worlds. Wellesley is a fabulous school, so congratulations!