Hi there and welcome
For your wife to access the emails, have here go to www.gmail.com on the computer.
Then as you will be likely signed in, click on the circle at the top right an click on sign out.
Then click on Sign in with a different account
Then click add an account
You can then add your wifes account and sign into it.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know the results please.