Hi Boomer..
I am going to suggest a different approach than you have so far.
May not be right, but consider it.
Your new dog had a street life in the South. She has had a litter of pups, two of which have roundworms, based on your worming.
Her medical efforts so far have found nothing amiss except a slight anemia and a high eosinophil count. Her water intake is not excessive according to lab results. The pups may still be nursing, or only recently shut off.
The only truely reliable test for parasites and heartworms is a positive test. Not finding any suggests another look if there is suspicion.
Eosinophilia is normally in response to an irritation like allergy, or parasitism. I am suspicious that Momma has roundworms too, since that is where the pups got them. Hookworms are very common as well. And heartworms may be a silent infection. Her scratching could be allergies to a light degree since she is a young dog. Anemia, slight, may be due to a lot of things related to living on the street and pregnancy.
Essentially, she may be a normal mother that needs care, possibly a worming for both hooks and roundworms using a medicine safe for use with heartworms (just in case).
I see nothing suggesting a rush to find something. Give her some more time.
For what it's worth... discuss it with your vets.
Hope this offers another route for you.
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