[Lady of Yorkies]

I'm looking for help with a new female I just bought. She is 22 months old and never had babies. We haven't had her a week. I have 2 litters of puppies that are 5 & 6 weeks old. She has bitten everyone of the older puppies. She only harmed one and it looks like he will be ok. She jumped from the back of the sofa into the xpen where the puppies were. The woman I bought her from says she doesn't know how the female will act with puppies cause she hasn't been around any. Well, now I know. The female is in heat, she started the day after I got her. An online friend said she had one like this but that she calmed down completely after she had her own puppies. At this point I am afraid to see what she would do with her own puppies. I don't know whether or not she would let them live. I have another female in heat at the same time so if I breed this female I could take the babies and give them to the other when the time comes. I am keeping her in a cage all the time except when she is walked on a leash to potty. The mother of the puppies attacked her tonight, 2x before we could get them separated, the second time the female fought back and before we could get the mamma away the second time the new female grabbed for the mamma and got her hair. We put the new girl on leash next to the food and water bowls and left her there for a while because I have heard it makes a dog mean to keep them caged up all the time. We do have food and water in her cage so she is covered both ways.

I want to know what anyone knows of how to break her of this nasty problem. PLEASE!!! I bought her to breed to a certain male and now I will go ahead and breed her and pray for enough puppies to pay for her and the harm she caused the one puppy. After that if I don't see a drastic change in her I will get her fixed and find her a good home. I must include that this is a wonderfully sweet, loving dog except when she is around puppies. She has made no offer to hurt anyone or any of the other dogs unless attacked first. I don't think a vet would put her to sleep but I have thot of asking. Anyone with any advice? Please? Sylvia