Admin accounts to transfer fully to a user account

Admin accounts to transfer fully to a user account

Hi,
I am a super admin and I transferred over 50 accounts to a new user [salesperson].
She only had access to the account view, not the contacts, emails, etc as it seems tasks and information is still under my name eventhough I transferred the account to her.
How do I update her accounts in mass to enable her full access to her accounts?

Cheers,
Malcolm