I think you should go to Wellesley, if the finances work out. And Williams if that is a better financial situation for you.
Wellesley will change your life. My dear friend is an alum and she speaks so highly about the way of shaped her, the friends she made, the confidence she gained. I’m sure Williams is also special, but this is a unique period in your life, and being at a women’s college, closely connected to opportunities in Boston, still able to study abroad—I think it’ll be the right fit for you.
I think the Berkeley/Sciences Po option is maybe less appealing bc moving to a town outside of Paris without the language skills and without some foundational support as an 18 year old is a lot. If it’s a priority, study abroad in France, get a grad degree, etc.
My 2 cents—and congrats. Those are amazing options!