help with hotmail/outlook account?

[Fuffy]

my mother in law made a new hotmail account about two months ago & she just came back from a holiday so she is ready to sort it out for her business. The thing is microsoft keeps saying that her account does not exist although i know it does because i was there next to her when she set it up along with a business facebook page. She is unable to log into facebook since she forgot the password but cannot reset it because apparently her email does not exist. I am not sure how to fix this, was hoping someone would have a clue? Thanks.