I am not recommending it, but were you to book an award ticket with her, select E+ seats for you both, and then cancel your award ticket her E+ seat might "stick", but you risk (or she does) a plane change or other even that could cause her to lose her seat, with less attractive selections available after that happens.
Of course, if you don't cancel within 24 hours and you're inside of 60 days, you will pay a redeposit fee (unless 1K)