help with someone trying to get into my account

my xbox acccount is under the same email as my moms email when she helped me set it up when i was a kid. all of her accounts got hacked this week under her email, her facebook, insta, all that and shes been in shambles and no ones helping her and she lost them it seems. now the hackers trying to get into her microsoft account aka my xbox account and he has been trying to guess the password all day, i have a decent password and 2 factor authentication but im scared if he gets into it. He knows how to change emails from within the accounts he hacks, please someone give me some tips on how to make sure he doesnt get into it.

:)