Well it sounds like the snakes probably developed issues with all the moving multiple times in the past weeks. Plus housing them together would have me worried right off the bat. Hard call there. I mean if its sort of a friend, I would think she would help you out but also if she is selling off her whole collection, then she probably wont want them back. Sounds like you might be stuck between a rock and hard place. I mean you can try and give them back to her and if that doesn't work, find your local Herp club and see if they will take them in and give them the vet care and stuff they need. Or move the sick snakes into a different room, give them treatment and remember to take care of all your non sick snakes first, then the sick ones and be sure to wash your hands inbetween handlings and don't use the same utensils on the old snakes and your sick snakes. Best of luck.