That is correct. If you daughter is a dependent on your return, and even though only she is on the Marketplace insurance, you still need to enter her 1095-A in your return, if it is in your name. The family annual income is then used to do the calculations on Form 8962 for the PTC.
When she first enrolled, the Marketplace needed to know how many members in the family, and the estimated family annual income. If they didn't have this info, you are correct that the APTC may have been calculated incorrectly, and they gave her too much credit each month.
There is a limit on how much of the APTC needs to be repaid, however. Here's more info on How is the Premium Tax Credit Calculated.
Possibly not claiming her as a dependent on your return would be more beneficial, and she could file the 1095-A on her own return. If the 1095-A is in your name, you can indicate that you shared the policy 'with someone not on your return' and allocate 100% of the premiums to her. Here's some info on Complex 1095-A Situation.
@thoefflin
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