Hello ConnieTrail and welcome to the cabin. That is one heck of an 'ask' your relative has made and it is going to cost, whilst not as much as a medevac, it will be significant. My own mother wanted to travel long haul when she was in her late 80s but the doctor said No. I expect more people will offer information in the next couple of days, if you can be patient. It most unfortunate that she is frightened of the ocean.