I’m so sorry for your loss. It’s so hard to lose a part of your family like that. Binky Free Mocha <3
It really could’ve been anything that took her life, so don’t feel hard on yourself.
As for another bunny, that’s a decision you need to make for your family and Luna. If you get another bunny, I suggest taking Luna to a shelter for speed dates that way she can find a bunny that’s compatible with her and her demands, and of course they will already be spayed so you won’t need to do that. You’d have to give the new bunny a good month to settle in before you start prebonding and then eventually go through the bonding process with them. So whether you go shelter or breeder route, you still have to wait to bond them, but it will be a significantly shorter time if you get a shelter bun.
If you get another bunny, don’t think of it as replacing Mocha. Mocha had the best life a bunny could have. I personally believe that our bunnies would want what is best for us and their friends when they cross the Rainbow Bridge. Maybe now isn’t the right time, but maybe it will be in a few months.
Sending vibes your way <3