So sorry you are here...
Not sure how long ago your DDay was but I am hoping she has been open and transparent.
Well gmail is a google account and yahoo will be a different account. Looks like there might be two accounts. See if you can look in the internet history to see what websites were opened. Of course if the history was deleted then you can't tell.
So you can just wait and see or you can install a tracker on the computer to check.
Or you can ask her straight out that you want access to all accounts. And still add the computer tracker.