Ambassador, British Airways Executive Club, easyJet and Ryanair
Join Date: Sep 2011
Location: UK/Las Vegas
Programs: BA Gold (GGL/CCR)
Posts: 15,913
They must be on a single booking, nothing stopping you from cancelling the return sector for your daughter after the outbound flight. They will simply separate her from the booking. Call the GGL Team and ask their advice, you are doing nothing wrong!