How can I get my mother’s account back ?

My mother, long long ago have created @hotmail.com account. 

Unfortunately, she has forgotten the password, she can give all the detail, but dont count on her memory.

This account has been created LONG ago, when She had outlook.com. She can't tell date about her last log in on her account. Because she dont know it. As i said, She can tell all the details that she know. I really need this hotmail account. Because, I was registered on it for a game.

Additionally, e-mails that should make her account safe, has been made by me, when I was probably about 13 y.old. I have forgotten all the details.

Phone number has been changed multiple times, cause of big period of time.

My mother can give all the details that you want. But please, dont ask her about the phone number, or date of last log in, because without calendar or something else, its very hard to remember even by geniuses. 

She can say, date of her birth, her maidens name, her father's, her mother's name. The place that she have born in etc.

If somone can help me, please do it. Cause I really need mail that is inside *** Email address is removed for privacy ***, cause it's important for me.