@Ladylsj - I suspect the problem is that dependents who apply for Marketplace Insurance are not eligible for the premium tax credit.
So by claiming your mother as a dependent but at the same time she obtained Marketplace insurance creates the problem. It has nothing to do with the fact that YOU have medical insurance through your employer.
did the amendment add $1650 to your tax return?????
https://www.healthcare.gov/income-and-household-information/household-size/
(look at the very last "more questions" in the link above.)
