i got 2 female huskies the one husky had pups 3 days ago and the other female is killing them anyone no why

Yes, it's simply called dominance.  In the wild it's not uncommon for the dominant female of the pack to kill (and eat) the young of another female - to preserve her and her offspring's place in the pack.  I think it's very rare for a good breeder to allow non-parental dogs into the birthing area.

Sorry Ami. Just came back to see if the OP had come back to say anything that I hadn't seen. It looks like she stayed on long enough to read my response and left - c'mon, it wasn't that bad.

But just for the comment, from my experience that scenario is all too common in rabbits and heaven forbid if there's a buck in the picture, It's fairly common in canines and, again from my experience, it seems to be rare with cats.

You should have never allowed the other female access to the litter....nor should ANY other dog be allowed in the whelping area.