I recently added 7 new young hens to my flock and foolishly didn't quarantine them. Now three are sick with what we suspect to be MG. Two had one bubbly eye, fluffed up and sleep a lot. I got them on water soluble Tylan yesterday. One is dining and eating just fine. The other i administer the water by dropper but she eats fine. The third is my concern.. i noticed she was sick today because she kept opening her beak and stretching her neck. She will eat but i haven't seen her drink anything so i tried to give her water through a dropper but it comes right back up in frothy bubbles. I don't know what to do. There appears to be a small growth on her palate and she does sound stuffy when i tried to get her to drink. Is she beyond help and dying? What should i do?