So I just got a 2 week old puppy from a friend olny because the mother would not let her feed no more,. so I gave her formula and milk and ever since I did that she has been getting sick

You need to get to a vet quickly, this pup is way to young to be away from its mom and litter. The mother may feel there is something really wrong with the pup and is rejecting it. A vet will know if this is true and what to do about it.