I know. My sister told me another medical analogy as well. "When you hear hoof beats, think horses, not zebras."
She displayed EVERY sign of a panic attack. It fits PERFECTLY. It explains EVERY symptom. It is the most likely cause, and I see no evidence for her magical EIB. She's using that as a crutch to escape blame for panicking.
She he should be medically examined, if only to see if she has COPD from smoking. But until then, I'm going with the best fit and most likely cause. Panic Attack.
Heard that one too, and before you talk about horses and zebras, you have to know your taxonomy. From her description, she is at high risk not only for COPD but also lung cancer, diabetes, coronary artery disease, peripheral vascular disease and hypertension, among other things. Your sister may be able to provide you with more information on this diver's potential medical issues.
I'm not arguing against a panic attack... I think it's quite possible. It's helpful to remember, though, that you are basing your opinion entirely on what the OP has written in this thread (unless she's PM'd you her medical and social history - if so I apologize). If you drill down, you often discover information that's not in an initial report, which is why it's imprudent at best to draw a hard conclusion without a thorough investigation, especially if that conclusion involves directing an individual who may need medical attention away from that attention. I'm glad to hear you advocating that she be seen by a physician.
Best regards,
DDM