You can get ObamaCare as a secondary insurance, but you can't get tax credits on it. Generally holding more than one comprehensive insurance plan makes no sense. However, there are exceptions to this rule (such as when both spouses have an employer plan, when a person holds Medicaid and Medicare, or when a person holds multiple parts of Medicare). so basically all those premium tax credits she got have to be repaid
did her marketplace insurance cover you because it is very easy to err when entering the 1095-A. also if your household income line 3 of 8962 is more than about $70,000 you are not entitled to any credits. we can't see your return so you'll need to review the form.
