Raw meat supplement for cats with allergies

I have an 8 month old cat with allergies. She reacts to all fish, chicken, dairy, and grains. I am at a loss to find a good quality supplement to mix with raw meat that she can eat. I am also on a tight budget and will be for a long time to come. Thanks to anyone who can help!

I fed prey model raw and rarely supplement. About once or twice a week I give Ritz 1/2 egg (freeze the other half). Of course I also feed liver, kidney and bone. I have in the past given her some krill oil for Omega 3 (human brand); there might be non-fish supplements that have Omega 3. This one appears to be non-fish.
What supplements were you thinking about?

Give us an idea of what you have in mind.

Basically your choices are ground or what is commonly referred to as frankenprey (also known as "prey model").

With ground you combine grind meat, optionally with bones, and possibly organs. Supplements are usually added.

With frankenprey you don't grind the meat and organs but rather cut them into manageable sized pieces that require the cat to do some tearing and gnawing. Most believe this method requires less supplementation than ground while some say it requires none. There are guidelines for how much of what is fed should be meat, organ and bone.

If you're sure you want a supplement pre-mix to add to raw as your post seems to indicate you can take a look at the "Nutritionally Supplements" section of this:

http://www.thecatsite.com/t/264154/raw-feeding-resources

My cat is on an elimination diet and only eats venison (home made raw) for a few weeks. The food consultat advised me to add iodine (in algae) and bonemeal/ raw bones from venison. I have doubled the amounts of egg yolk (to 1 per pound of food). My cat loves it!