Hope things have calmed down for you all now.
Eleanor, the mother of two kittens I had recently here on foster became very agressive towards my dog when her babies were about 3 weeks old. She had been fine with the dog until then. I made sure mummy and babies felt safe, and seperated her from the dog when I was not able to be there. Gradually it got better for the dog as her babies got older. She is fine now that her babies have gone, it was just her being a good mummy.