Will Falconer, DVM Moderator
Hi Tiffany,
My best advice would be to seek out a qualified homeopathic vet to treat this dog. One, it's 100% safe in trained hands and two, it'll get her susceptibility to ALL worms cured. Merely killing worms with a poison is never going to touch her susceptibility and, as you've experienced, "killer" drugs aren't safe.
I tell you how to find one on my Recommended Resources page. Scroll down to the AVH list and be sure to watch the video there on how to choose the best one for you (even if none are local to you).