Wrong Display Name

I've just setup a new email account for my daughter. I used my name in the account setup. I've followed the instructions in other forum threads to change the display name in sent emails to her name. When I go back and check 'Send Mail as' it is correctly set as her name. But still when we send test mails (from either the mobile app or webmail) the recipient account displays it as coming from my name. What else can I do to change this? Thanks!