you may want to try halo pet's herbal flea dip.
it is just a concentrated formula of essential oils that you mix with water (instructions are included) and mist on your dog. i have a big black fuzzy dog and hate the idea of giving him chemical flea&tick stuff year round, so i alternate between frontline and the herbal option. you can also add brewers yeast to her food (sprinkle it on her food) as this is a natural flea&tick remedy as well.
as far as food is concerned, i was going to first suggest honest kitchen, but then i saw that you've already tried that.
another great product that is grain free is "nature's variety"
my dog doesnt have any allergies, persay, but its a great quality food and he loves it!
here are some links to help.
http://shop.halopets.com/Herbal-Dip-5oz
http://www.naturesvariety.com/
good luck!