She did kill the babies. They died from birthing complications, And she isn't a first time mom. In fact right now she is fostering another females baby that was getting bullied by siblings. First time moms or any time moms rarely kill their babies. But things can still go very wrong. Just like males most males do fine with babies...but there are a few who don't,.
Jade is a wonderful mother and her and the other females in the colony are caring for the foster baby I gave her the night Domina died