From all the research I've done, doctors have no clue about parasites nor have they really studied them at all. I asked my cousin who is a nurse if she ever studied parasites and her answer was ..... No. Wow! parasites are everywhere and do exist. So I have to ask myself why are they not learning about them??
Anyway, I'm sorry you are going through all of this. I don't claim to be an expert on parasites, just having issues with them myself, I can tell you what has worked for me.
I took a parasite cleanse called SCRAM, it worked so I thought it cleansed me of all parasites. Wrong. It did help tremendously though.
There's 2 things I've run across that has helped and that's eating fruits with seeds, especially watermelon. And enemas with lavender oil. Lavender Oil Enema s have helped greatly in killing parasites.
I looked up black parasites and it seems to be some type of fungus and could be something called morgellons. This is what may help you... Topically, you can try some of the antifungal and antiparasitic essential oils to try clearing it up. Rinse the body with Sea Salt in warm water and then apply the essential oil of your choice, tea tree, lavender, oregano, garlic, clove, etc. I would do this daily. And this will help your daughter too. I find oils to be very healing and these things hate lavender from what I've learned and personally experienced.