So you're sure she's really hurting them, like making them squeal?
If so, you may end up having to bottle feed them with KMR milk replacer, but be sure she's really hurting them. I would call your vet, or an on call vet first for advice before you take them away, because Mom may reject them after you start them on KMR. If you do take them away from mom, they would need to be kept warm by a hot water bottle, but not too hot, and bottle fed every 2 hours(even at night), then stimulated to go to the bathroom by imitating moms tongue with a warm wash cloth.
I hope everything turns out alright
You've had a very busy, stressful day...