Skin and bones mother dog pregnet again?!?

Hi, for those of you who remember the "breeders" that i rescued the 4 5 week old female heelers from then the half dead male puppy heeler a few days later. The mother dog might be pregnet AGAIN! she is skin and bones. There are still 5 puppies left from the last litter. They are left outside and eat what dead animals they can find. The people do not want the mother dog or the last 5 puppies and called me and want me to take them. I told them i would. Muma dog couldnt be more then 1-2 weeks preg according to the owners she went into heat about a week and a half ago, the parents tied 6 times that they say. They have never been indoors, never been socalized with other dogs.
The lady said she would drop them off 2morrow afternoon. How do i introduce muma dog to mine and my freinds dogs (we live together) in total 7 dogs. 3 males, 4 females. How do i introduce her to the inside of the house?
How do i care for a pregnet *****? How often do i feed her, as i said she is skin and bones and will need to get fat and neuterants into her before the next litter is whelped, then she will 100% be spayed. Can the puppies (7 weeks old) be dewormed? Shots? Can mother dog be wormed and get her shots?
thanks!!