Hi,
It is not a matter of if Wellesley can give you an affordable offer, but will Wellesley be an affordable/financially feasible opton for all four years you are there. Remember you myst apply for financial aid every year. Your family owns their own business which is going to be different from a salaraly job because the ebb and flow of income will be different to predict.
You cannot have your dream school be a financial nightmare for your family.