Dog B is taking over dog A's puppies

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I have a little situation going on here. I have Boston Terriers and one had puppies 2 1/2 weeks ago. Heres the thing. Dog A had the puppies and she is a wonderful mother. She snapped at dog B while she was having them so for dog B's safty, we put her in the kennel for two weeks. We brought dog B back in on Sunday since dog A seemed to have mellowed out a bit. To make a long story short, B is now spending a lot of time with the puppies to the point where the pups are attempting to nurse from her. I have heard that a dog can lactate with stimulation and produce milk even though they have never been pregnant. The weird thing is, B is such a sweet happy girl, she will be a year old in June. She actually growled at A when she attemped to feed her own puppies. So far I haven't noticed A neglecting her pups. Would you just leave it alone and keep an eye on them or put B back in the kennel. Also, A, had nine pups, she has 8 teats. Which wasn't a problem in the begining. My husband said we might need to supplement the milk since they will require more as they grow. Now I'm thinking B might be of help if she starts producing milk. I would appreciate some input