As far as I know only registered guests currently staying at a WDW resort can book a BB return stay (i.e. you can't book a BB room for someone not currently staying at a WDW resort) - and the CMs do check to make sure you are a current guest.
I do know I've read here that DH/DW each use their names to get two rooms, so if your daughter will be returning with you for the BB stay, I would check to see if you could use your daughters name to hold the 2nd room. Hopefully other DISers who have done this can post what they did when the second person in the room is a minor.