About bottle fed cats?

i have a bottle-fed spayed female cat who is about 4� years old. she eats EVO dry food from the health food store, which has no grain in it. a month or so ago she started fur mowing, which is a form of self mutilation where they systematically chew their fur off down to the skin. i had not heard of this condition until my cat developed it, and i've not been able to find definitive answers to this problem. even the vet took a wait-and-see approach because i don't think he really could pinpoint the cause. we had a very cold winter this past year, which forced me to spend a lot of time in the house. as spring approached, i began to spend quite a bit of time outdoors, working in my yard. this was about the time she started the fur mowing. i've wondered as of late if this could be caused by separation anxiety as this cat truly considers me to be her mother and she sticks to me like glue when i'm in the house. (she is strictly an indoor cat). other than that, allergies could be the cause but i can't think of anything that's changed in her environment. at this point, it also may have become habitual and i'm considering getting her shaved, or a lion cut, to break the cycle of overgrooming. any information would be greatly appreciated as she otherwise has the most beautiful, shiny coat. i am truly perplexed!!