Probably depends on where she lives. Initially in our hospital these operations were done as private cases, but in more recent times, have been done on the NHS.
Having said that, we haven't done any recently, as the consultant who did them has now retired.
Unfortunately, this kind of operation is given an incredibly positive spin by the media, when it can have severe anf potentially life threatening complications. If there is any other way she could possibly lose weight, she's much better off pursuing alternative methods.