Gotta get her worked up to that kind of commitment. I started playing BG3 in December and my wife saw a few hours of game play and then bought it for herself so we could co-op. We are in Act 3 in the co op game and I'm still in act 1 in my solo.
I don't have any friends so I've never played coop and I've always wondered, how does the game manage romance in that mode? Can players romance each other? Can they even talk to each other with dialogue options? Do they just both romance different people? How does that affect the ending???
Larian published a tongue-in-cheek guide a while back saying that you can't romance your co-op partner, but if you both kiss the screen at the same time, an electrifying feeling akin to love will occur.