Isn't she connected with a dialysis center at ALL? There should be a social worker who can help make arrangements. That's part of what they DO.
You've got to remember, even in a vacation destination, dialysis centers serve local residents first, and on a multi-day, regular schedule. It's hard to 'fit in' other patients. The patient's treatment has to be adapted to what hours/days/slots are available at a given center, not the other way around.
Plus, she'll be responsible for her own transportation (although that too is something a dialysis center social worker could help with). And she could find herself having to be somewhere at 5 AM; or at 11 PM; or right smack-dab in the middle of the day.