I think she would want the best for you. If getting another bunny makes you happy then I would do it. Loss is hard but the time we have with them is so worth it. They are total blessings in our lives.
I was scared about getting my bun neutered too. He is my first rabbit ever. But I got it done. He did really well. I don't know if that helps you feel better about it or not. But just wanted to say I understand the fear of it.