Both Pearl and Starr are allergic to grains so now all of my cats are eating Innova Evo canned food and dry because it's grain free. Starr has a colitis and IBD and Pearl has eosinophilic granuloma complex (EGC) which in her case is caused by a food allergy. I know that diagnosing a food allergy or any allergy is very difficult and I would also recommend that you try going to a holisitic vet. I sure hope that a vet will be able to help Chloe and hopefully it's something that can be easily treated. Good luck.

Chloe could also be losing and biting her fur due to stress so it may also be a behavioral thing instead of an allergy. Is she an easily stressed cat? You might want to try using some Feliway/Comfort Zone plugins unless you've already tried these before. Good luck.