Very sad about the passenger.
Well, I'm not a doc, but the fact that she complained of being extremely thirsty after consuming a meal might be a symptom of a diabetic emergency. Blaming the crew is pointless. They're not medical professionals, but if it's true that a couple of docs were onboard and the oxygen tanks were empty, and the defib paddles were not working, then the airline might have some legal issues to contend with.
Thankfully only once in my 25 years of marriage and traveling, did my ex-husband (he's a doc) have to respond to an emergency medical situation onboard an aircraft. The crew were professional, asked if there was a physician or nurse onboard, my ex went to assist and then asked me to assist him - thankfully it was nothing more than a mild tachycardia and panic episode. The patient was stabilized and comfortable on the floor of the first class cabin until we landed and then transported to the hospital.