Lost 4 kittens. 5th in vets

I foster and have for 2 years. I have 2 happy and health queens in my cathouse with 6 health and happy kittens between them.
However this week has been the worst week of my fostering experience. I have a feral cat that had 5 kittens, 3 in the morning on Thursday one dead shortly after birth and 2 in the evening. On Saturday morning we think the 2 born Thursday evening were dead and nearly gone. We left the one that was still alive with mum in the hope that she may take it back and intervened and hour later but it was too late. One more dead Sunday morning so we took the last one in to hand rear. She was doing well Sunday and all day yesterday took her 2AM feed well but at 5AM only has a very small feed. At 8AM we struggled to wake her up. She is now in the vets. He thinks that she has an infection and is on antibotics At 5 days old we are not holding out much hope. I just need some hugs xxx