Characters from one account to Another
Two things.
First, you just admited to breaking the EULA (It is against the End User License Agreement to allow another person to use your account.)
Second, this will never happen. This would facilitate people selling characters for real money, something Anet would not want to see going on.
Just buy her a copy and get her to level up a new character. You can delete her old character and in 24h the name will be available for her to attempt to claim again on her account.
Given that sharing accounts is against the rules, and that this would enable selling your character, I don’t see this happening.