If that is what is happening, she'd have to eat all the hair on her head for her to poop out piles of hair...
Sorry, but this sounds like a bunch of crap. And if it isnt, for goodness sakes get your sister to a doctor, asap!!
I DO NOT GO ON HERE ANYMORE. I HAVE LEFT THIS PLACE FOR GOOD AND DON'T INTEND ON COMING BACK. PLEASE DON'T FRIEND REQUEST ME, PRIVATE MESSAGE ME, OR ANYTHING BECAUSE I WILL NEVER SEE IT AND YOU'LL NEVER GET A RESPONSE. THANK YOU.