No, without the account and user she cannot sign in to the other person's account. She can get a free transcript from the IRS or for a fee of $50 per return, actual copies of the returns from the IRS..
You can get a free transcript from the IRS:
https://www.irs.gov/individuals/get-transcript
But she has an attorney. The attorney should be demanding that her soon to be ex provide a copy of the tax returns.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
