Well this is going to sound nuts but, has she ever been bitten by a tick? The Lone Star Ticks cause Alpha Gal a meat allergy. It happens hours after eating meat. Mine was always around 2-4 AM Id wake up doubled over with stomach pain, followed by explosive diarrhea and sometimes vomiting, after that I would break out in hives from scalp to souls of my feet, then sweating, followed by violent shaking and chills. These episodes vary from person to person. Sometimes I would eat meat (red meat, pork etc not chicken or fish) And FYI meat products come in all kinds of strange things, like marshmallows, and vaccines in the form of gelatin. I lived for decades with it and never knew what it was!
A simple blood test can rule out Alpha Gal.