It depends on whether it is a gift or not. A gift is something received for which you don't have to give anything in return. So, if she paid off the mortgage and in return is staying rent free, then the payment would be rent and would need to be reported on your tax return as such.
You will see a section in the Income and Expenses area of TurboTax where you can enter rent income and related expenses, such as property taxes, repairs and insurance.
If she was staying there rent free before she paid off the mortgage, then it might be considered a gift.
@arunp1982
[Edited 3/10/22 at 5:58 PM PST]
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