Natural food for a cat with seizures

Out shelter has a cat that was recently diagnosed with Epilepsy. She had her worst seizure to date, it last 1.5 mins, and the post ictal phase was lengthy. For several reasons, we are hesitant to medicate her. So in looking for alternatives I came across something that said to switch a cat with seizures to an all natural food, no dyes & no chemicals. This makes total sense to me. I am more than willing to bring this up to the other board memebers at the shelter, but I would like to have a good choice when talking to them. Foods that we get donated are not that good, so that is why I want to put her on a specific diet. I am pretty sure we have gotten large quantites of Natural Balance Duck & green pea (we have multiple cats with IBD) donated from the PetCo foundation. I'm just wondering if anyone else has experience, or advice about what type of food would be helpful to feed her.

In my Lola's case food doesn't matter. I've never heard of it helping.

Can you elaborate on why she cannot be medicated? I get Lola's pheno compounded & it costs me roughly $65 for 4 - 5 month supply. It was costing me $15/month for the pills (but I couldn't get an exact dose on them for her).

Cost is not the issue. The vet feels that it would be hard to know if the meds were working because she is in the shelter enviornment. Being a small shelter, there are times when people are only around for 4 hours. Then the cats are alone for 20 hours. In addition, the vet was concerned about liver toxicity and said, unless she was having 2 or more a month he did not feel it was worth the risk to her liver. Finally, the real issue would be that she is semi-feral. She came to us as a feral kitten at about 6 weeks old. She never learned to trust us. I'm not begining to wonder if the seziures are part of the issue. We can now, after 3 years, able to pet her. There is no way anyone would be able to medicate her. In order to get blood work & vaccinations on her, the vet had to come to the shelter and sedate her. Luckily the vet will be back on Friday of this week and then we can talk about what happend and if he has any additional recommendations.