I’m sorry, that is very sad. I was in a similar situation. Merlin died, and Guin was left alone and sad. I also have 2 M/F pairs. So I was left witht he choice of 1 pair and 1 single bun, a trio, or adope a new male for Guinivere. I tried the trio. Didn’t work. They have been livingnext to eachother and get along through the fence, but Avalon doesnt’ like Guin. Guin and Morgana coudl be a good match, but Avalon is not interested in the least, and shows aggressive posturing towards her. So a trio was out of the question. Guinwas sad for about a month. She stopped binking, stopped running upt o me for greetings, stopped showing all signs of bunny joy. It was very sad. Rabbits do mourn. After a month, she started to cheer up, and I adopted a new pal for her. I wanted to wait untill she ws in a happier frame of mind, before introducing a pal. I don’t know if either method works just as well, but I waited untill I started seeing her act happy again. I adopted Lancelot. He as amazingly calm, easy going, chill. I thought it would be an easy match. Guin disagreed. I was VERY suprised at her reaction. She attacked him immediately. COnsidering that her and Merlin tok 1 week to become snuggly, and the other pair took 2 weeks to become snuggly, I didn’t expect Guin to react that way. It took 8 months to get them fuly bonded. Today, they are the snuggliest pair of bunnies EVER. They absolutely adore eachother, and Guin is happier than I can ever remember. While your bunny is mourning, give her lots of love and support. She might ignore you at first, but she will come around and appreciate yoru affection. Once she starts showing happiness again, I would get her another pal.