" Is there a way that she can just review the tax return and sign it on TurboTax without gaining full access to TurboTax so she doesn't try to change anything?"
No. If you give her your login password, she will have access to everything. If she agrees to file jointly, I suggest you print the return, get it signed in ink, and file by mail. That's really the only safe way to prove that she agrees to the filing, and would prevent her from claiming fraud on your part.
This is something that should be handled by your attorneys.
