Filing Taxes for Deceased Mother

I just filed my own taxes on Turbotax and need to file taxes for my deceased mother and a special estate taxes for income she earned after passing away. What's the best way to do this. She doesn't have a huge amount of income, so perhaps she could qualify for the free file on the IRS website. She will have some K-1 and 1099 income, am I able to enter those one the IRS website?

Could I enter a second 1040 income tax on Turbotax? There doesn't seem to be that option in my account.

Any advice on the best way forward would be appreciated.

Thanks.