I don't know if/how Vessel stores the master password. If you lost the master key and there is no way to extract it from Vessel, I guess there is no better way than starting a new account. Maybe the developer of the tool (@jesta) can help you.
I would recommend that she creates a new account via the normal registration process on Steemit.
Thanks for the reply. Her account is safe other than no one having the master pass lol