If she used outlook, they would be stored in PST files that can be easily connected to any computer using outlook
everything is right there, so easy, even the fools at the FBI can do it!
They would only be in a PST if she either moved/copied or had a rule set to move them. What’s more likely is the client had replication turned on and the files were in a OST file (Offline folders). This file is in a folder that is hidden.