Do you know for a fact that your mother's 2017 tax return was filed with the online version of TurboTax? If she filed with the CD version of the program, then the 2017 tax return is not online in any TurboTax account. It would be on the computer that TurboTax 2017 was installed on.
However, you should be able to get what you need directly from the IRS at <a rel="nofollow" target="_blank" href="
http://www.irs.gov/individuals/get-transcript">http://www.irs.gov/individuals/get-transcript</a>.
If you need to get into your mother's TurboTax account, there is a specific procedure for that which must be followed to the letter for legal reasons. But if you can get what you need directly from the IRS, there's no need to bother jumping through all those hoops.
