If she was required to file a return or had some income taxes withheld you should file a return.
If not, there is no reason to file a return.
If you do file a return, make sure in the Personal Information section you mark deceased as there is another Form TurboTax will generate for you to correctly file the return.
Sorry for your loss.
You will need prior year software to do this.
https://ttlc.intuit.com/replies/3301770