String:Or just stick to her certification level and not have to spend a penny more on top of her trip policy which i suspect cost about £20 in total.
DAN really isn't needed here unless teaching or going below 30m. Every normal non diving holiday policy i can think of covers to 30.
You have 2 options, either dive to the limit of your travel insurance or take out extra paid for diving insurance.
Unfortunately here this person did neither.
Happened last year as well to someone left with a bill of over £50,000 as a result.
Ahhh, but here is the rub. In you first post you listed "guided" as a requirement. Guided dives in North Carolina are almost non existent and are rare in Fla. Same goes for the rest of the US. Other places like Bonaire and Curacao do not often supply guides. I suspect there are many other places as well. In addition, if these insurance companies are like most, 30.000001 meters is enough for them not to pay. Who is and is not a guide is another problem. Add to that many medical facilities on this side of the Atlantic will not accept a lot of insurance except DAN. It's cash, CC or go away. Fighting with the insurance company and most likely not being paid is your problem.
The other problem I have with non dive specific insurance covering diving is how coverage is handled. Not having seen the travel policies you speak of, this may not apply but many general medical policies here require "approval" for special treatment. If you don't get approval from their doctor first, they don't pay. If I am hurt diving, I don't want some insurance company doctor who has zero knowledge of DCS deciding if a chamber ride or air evac is necessary or not.
The general travel policies may be a good idea but I would suggest a careful study of the actual policy and some research on their actual payment record before using them in the place of a specific dive accident policy.