@JHUstu
You cannot claim your daughter as your dependent. She does not meet the Qualifying Child Rules since she does not live with you. She does not meet the Qualifying relative rules because (I assume) she makes more than $4200 for the year.
So, you did NOT file your daughter's taxes incorrectly this year.
You seem to be introducing new questions about state taxes:
Q. So, you are saying it is ok to leave the two states on the tax return where they went to college?"
A. You child is now a resident of the college state, since she stays there in the summer. You also say she moved there in 2019. She files as a part year resident of both states.
Q. I can keep the two addresses on the tax return as they were previously filed as you are saying they are only being used as a mailing address?
A. There will be no amended returns, so the question is moot. But, you only put one address on a return (where you live at the time you file or where you want the IRS to contact you).
Q. The problem is that they have to pay taxes to the state where the income was earned, and Turbo tax automatically assumes you are a resident of the state where you mailing address is on the tax return.
A. Not exactly. You first tell TT, in the personal info section, which state you are a resident of (it does not go by the address you enter), then you tell it if you had income from another state. Or, in your daughter's case, that you moved during the year. In the state(s) interview you will be asked to confirm residency.
