I'm so sorry that it was her time to pass on. I would give Houdini a stuffed bunny friend to cuddle with right now. It can be very hard on both the bun-parents and the bunny that is left behind when one bun crosses to the bridge, but I think it is best to wait until you are ready for a new bunny friend. It is very hard to get excited about another family member when you've just lost one, and you may not be in the best place to make those kinds of decisions for a few weeks even. I know of stories where it has worked out, but in my experience, it was best to help our bun who lost her partner by spending extra time with her, and wait several weeks before looking for a new friend. It was terrible to see her missing bunny company--she'd sit and try to watch the other bunny pair we have even though they didn't get along at all--but we got to know her more personally and she opened up to us more as we did some of the things that her bond-mate had done for her (grooming, etc). Eventually it was time to look for a new buddy, and we were able to happily let another bunny into our lives for all the right reasons, and one of those was honoring the memory of the bunny we lost without feeling like we were replacing him. I know everyone is different, but I wanted to share our experience. Take some time to heal. There will never be another Cinderella, but eventually you will be able to think about her with happiness.