I think we're all "big-dealing" a very small problem. Pam is not the first person to take their CPAP camping. A simple Google search yields a lot of articles with people detailing how they camp from one or two days on a basic group 24 deep cycle to 4 or 5 nights using Li-Po batteries.
I'll bet her hubby's CPAP draws no more than 2.5 amps so that's 20 amps for an 8 hr sleep. He should easily get 2 nights and come close to 50% discharge. She could then hook up a good charger to the generator and recharge in 2-3 hrs. all for less than $200.
IMHO,
Eric