While your hen's symptoms could be from anything, they are symptoms of avian flu. If she dies suddenly, you need to get her to a state lab for testing. These are the labs in Texas.
Texas A&M Veterinary Medical Diagnostic Laboratory
Texas State-Federal Laboratory (Austin)
DoD Food Analysis & Diagnostic Laboratory
Texas A&M Veterinary Medical Diagnostic Laboratory
Texas State-Federal Laboratory (Austin)
DoD Food Analysis & Diagnostic Laboratory