How do you delete an account from Android Mail app in Kitkat...

A situation came up where I had to add my wife's email to my Android Mail app so she could get some important email... NOW, I've been trying to delete her account from the app, and I don't know how. She gets considerably more email than I do, so I'd like to remove her account as soon as possible, but I haven't been able to find any resolution to this...

Am I missing something obvious?

Thanks in advance