Cavitation or slimming machine (Gainsborough DN21 1JL)

I don’t mind how it comes my daughter has a rare disease that causes her to gain weight at a rapid pace and she is now 100kg and feels really insecure but she has her year 11 prom this year and wants to feel good in her dress she has tried a lot to loose weight but even if she does she gains it back and she barely eats and starves herself so it will be greatly appreciated if u can help