My mother passed away without an estate or will, she had one final tax return to file and I'm not sure how or what to do about this. Any advice?

[DDollar]

You can file a return for her using TurboTax.  There will be a box to check in the Personal Info interview section, to indicate she is deceased.  From that point, you just go through the TurboTax interview and complete the return just as you would your own return.  If you file your personal return using TurboTax Online, and want to do the same for your mother, you will need to create a new account for her return.