If you are on the same booking reference (PRN), then if either of you login into your BAEC account, you get both pax details up to OCLI. You have the tick, do you have all the other pax permission box to tick.

You can print both out or just your own. She can then log-in after and print her own BP out as well. That way you just meet up at the lounge while one of you waits in comfort.

You only need to hang around for her at check-in if she has to use your baggage allowance.

Me and Him Indoors often meet up in the lounge. I dash to airport via Hex from the office with my hand luggage while he arrives earlier by taxi with both our checked luggage if we can stick to one person's luggage allownace.