applications – How to update apps on a shared computer?

I gave my mom my old iMac after creating a new user on the Mac and importing her data via Migration Assistant.
I made her an admin, but kept my old user accounts on the computer, which have admin privileges.

Now there’s a prompt to update apps via the App Store but the login is my login and cannot be changed. It needs to be changed to her login so she can make updates to apps in the future without me being involved.

How do I sign out of the App Store for all users, so that she can manage updates on her own without giving her my password?