Adorable and thank you for fostering! I would say she is Beagle/Lab. Such a pretty girl. I would feed her some satin balls and don't forget to feed her puppy food as well as those pups will take a lot out of her and she needs extra calories. I would also have puppy milk on hand incase she stops lactating. Are you working with a rescue? I would have them help out with puppy milk, but do NOT get Hartz.