Im sorry you’re going through this, I just lost one of my buns so Ill be going through bonding too. His partner actually doesn’t act like anything happened, she’s eating normal but I do sense she is a little lost, she saw his body because I wanted her to have closure. And she isn’t very personable. Your bun might act like mine did or she may not act like it, you just won’t know.
I would say, since I’m in the same boat but have other buns, I will try and bond her with. I would wait until she is okay and through it and wait until you are mentally okay to do it. I would try and stay within a year of each other as older buns often do not have the energy as younger buns do and can get irritated at each other. I always try and do female-male bonds as they are often the easiest, its not impossible though.
I have a new Zealand(dominant female) and a dutch(submissive male) pair and they work just fine, its funny seeing him mount her, its like he’s mounting a mountain haha.