Oh, my. The dewormer, then, was a good thought. As far as "effective" dewormers that are also safe, the best is Panacur (fenbendazole) using one designed for dogs, not horses; usually given as a series of once daily for 3 to 5 days. Or, pyrantel, and very carefully following the dose for a puppy (this is a drug you give once). The one called piperazine does NOT work and can lead to profound abdominal pain.
I am quite concerned, but as I mentioned above this is going to be tough to treat at home. The most important thing is that you need to keep her eating as best you can. If she is not eating, then tempt her with something like people baby food (pureed chicken, "first foods"). Offer her an electrolyte solution for infants; the unflavored is best.
I wish I could guess on why she is bloated, but this really would require an examination and some testing to narrow down the exact problem. Certainly severe intestinal worms could be a problem which does lead to abdominal distention, and as I mentioned above these can sometimes be so severe as to lead to profound medical problems. Alternatively, she could have another issue like ingestion of an unusual item that is not passing through or a congenital problem (organ failure -- liver, kidney, heart) which is rare but possible.