Can’t log into hotmail account even tried account recovery

I'm trying to help my mum to regain access to her hotmail account *** Email address is removed for privacy *** but we're having great difficulty she doesn't use the acount very often so when using account recovery we only have a minimal amount of information and we can no longer gain access to the secondary email that was given at the time is there anyone that can help it would be most appreciated i can supply as much information as possible if needed. thanks