Cannot create email account as an identical already exists
We have 2 iPads and 2 iPhones. My wife's email account (hotmail) stopped to function on her iPad, so I followed the advice given and deleted the hotmail account to create it anew. However, I got the message that it could not be created as an identical account already exists. As the situation is right now, I have access to her account on my iPad, while she cannot get to it on her iPhone or on her iPad. We have access to her account on both our PCs, so it seems to be an Apple problem.)
She would like her mail account back. What must we do?
iPad, iOS 8.2