REVISION SELF PAY TO DS
http://www.duodenalswitch.com/
This site has confirmed DS surgeons and accepts no payments from surgeons saying that they do the DS when in fact, they don't or are very limited with experience. A revision from RNY to Ds is the most complex surgery going (I had one almost a year ago) and it is imperative that anyone contemplating this understands the risks are higher and finding a true experienced DS surgeon with a great track record is imperative.
Best of luck. I understand Dr. Peters in PA is the least expensive DS surgeon in the US at around 19,000 but do not know if he does revisions from RNY to DS. I'd start by calling the surgeons listed at above site closest to my home. It's a lot of work but so worth it in the long run.
My insurance paid for my revision with 2 of the top guns (Rabkin and Husted) because I had mechanical failure of my RNY, BMI of over 35 with comorbities, so perhaps your Aunt can investigate that route first.