Call the dept of agriculture. If they don't handle it, they will know who does.
They don't have avian flu. Chickens drop dead from that. But, they are sick and she could be contaminating flocks all over Texas.
Have there been cars in the garage. Are there oil spills. Has there been cans of gasoline? I have had chicks in the garage, but my garage has never had a car in it. I call it the basement.