It could be she's having an issue with chicken. I'd switch to a more different protein like pork/boar/beef/lamb instead of turkey. Be aware that if she has an issue with chicken then it can take several weeks for that reaction to disappear.
The shedding could be some form of detox or could be related to the increase itching/a reaction to the chicken.
The poop change is definitely due to the raw. Poop from raw fed dogs is a million times better than kibble fed dogs. Raw food is so much more digestible than kibble so their poop is much less offensive