No, you would not file her 2018 return with her 2019 taxes. You would file each year separately. Her 2018 return cannot be e-filed with TurboTax, you would mail in the 2018 return in it's own envelope & you cannot prepare a 2018 year return with TurboTax Online. To file a prior year return with TurboTax, you would need to download their 2018 tax software. You can download the 2018 tax software at the following website.
https://turbotax.intuit.com/personal-taxes/past-years-products/
You can file her 2019 tax return using the Online version.
