Mail in Frozen Characters Mailbox

I have this rogue named taase. She is on my other account. That account is frozen and i can't afford to activate another account. I want to transfer the rogue from that other account to this account. I can't because i have mail in Taase's mailbox. Can you please Delete the mail off her. I accidently mailed her the mail from my paladin named on accident because she has a similar name with my Death knight named tasse. Please Delete the mail on taase or return it so i can transfer her. Thanks