My parakeet has babies and she killed 2 of them, and quit feeding them. How do I feed these babies?

So this parakeet, Spunky, killed her two of her 4 babies. She literally ripped off one of their wings, and broke one of the baby’s necks. Two survived the brutal beating–a green parakeet and a beautiful canary yellow parakeet. The green baby knows how to eat normal bird seed, but the yellow one does not. How do I feed this yellow baby?