I’m so sorry for your loss.

I wouldn’t rule out rebonding her just yet. Every pairing is different, and just because Gizmo and Remix were hard to bond, that doesn’t mean it would be hard to re-bond Gizmo. Sometimes when rabbits experience the loss of a bonded mate, they re-bond more easily. Your room is also large enough that it could be split in two, so another rabbit could be a neighbor until the time was right to bond them. Even if not re-bonded right away, most rabbits are happier having a neighbor than being completely alone.

Is there a shelter or house rabbit society near you? It might be worth talking to them about options. They might even have someone there who could help you with the bonding process. If you explain the situation, maybe they could even re-bond Gizmo for you?

Most people agree that when a bunny has been bonded, they should be re-bonded, but you should keep a close eye on Gizmo to see how she’s doing. Give her extra love and attention, and make sure she’s eating and pooping ok as she grieves. You can try giving her a stuffy to snuggle with as a comfort, but make sure she’s not chewing on it. I did this with Bertha and would make the stuffy snuggle and “groom” her, and she would groom it back sometimes.

If she seems to be lonely and depressed, and you’ve exhausted all options of adopting another bunny, then it may be the kindest thing to re-home her, but you would want to be very sure that her new family plans to re-bond her.

Again I’m really sorry for your loss.