“To graduate, you must complete a minimum of 128 credits, 64 of which must be taken at Mount Holyoke. You must be registered at Mount Holyoke for four semesters a minimum of four semesters. This is the Residency Requirement. To receive a Mount Holyoke College degree, you must have a minimum grade point average of 2.00, meet the College and distribution requirements, and complete the requirements of a major.”
https://www.mtholyoke.edu/transfer/requirements
This SEEMS to say that 2 years satisfies the residency requirement. But if I were you, stitchpony, I would absolutely schedule a meeting (in person if possible, over the phone at the very least) to discuss how you want to enter regarding your credits and financial situation. Make sure that the FA advisor you speak to has your transcript in front of her (email it to her again if necessary) and make sure you are VERY clear that you need her advice on how many credits to transfer and what year to enter because your family cannot really afford the tuition as it is.
Ask her what she thinks your best course of action is. If there is a real, good reason to transfer as a sophomore rather than a junior, then have her explain what it is so that you and your family can discuss and weigh the pros and cons.
Please do this!