I m going to guess that no, her account will show nothing about you filing a joint tax return under your account. Think about it, TT is just a program to help you file your taxes. It does not matter at all if TT knows about the new joint filing. They are nothing but a filing cabinet on the net for old returns. Hers will remain available for her to access if she needs to, from previous years. I would make sure she downloads electronic files or paper copies if she wants to have them. From now on, the joint tax return will be found under your login information. Technically, though, she should have access to the joint returns, so if you don't want her to have the ability to see your previous, single, tax returns, start a new account under a new username.
