Filing multiple returns

No.  Go up to the very top of your screen to the Apple bar. Then go to File - New Tax Return. Then under Manage your returns pick Start a New return

First save her return.  Also be careful if your name is the same as another return. Turbo Tax saves the tax returns as 2023 Smith J Form 1040 Individual Tax Return.tax2023. So if you have two or more returns for people that have the same last name and first initial the second return will overwrite the first one. So you have to be sure to first save the returns with names completely different to keep them apart. Don't use the default name given by the program. You need to go to FILE - SAVE AS and give the return a unique name you can tell apart. At least add the full first name. You don't have to use or accept the name Turbo Tax gives it. I save all my returns with different names.

Each tax return is a separate document, like having more than one word processor or spreadsheet document on your computer.  You can only have one open at a time, but you can have as many documents as you want, and you don't have to finish one before starting the next.  Just save and close one before opening the next.