Heather,
I'm so sorry about little Gem. I know how heartbreaking it is to lose a life so young. I have lost two of my foster kitties over the past two weeks. One due to a birth defect and one was positive for FIV. Try not to blame yourself. You gave a loving home to the sweet baby and she died knowing what true love is. My prayers will be with you.
Maybe my kitties and your bunnies will be friends up at Rainbow Bridge.