SHE IS ONLY 18 BUT HAVING A GASTRIC BAND!

I was always very huge when I had my children and it got worse because I did not work. I have 5 children and the first two are girls. When they boys came a was almost bu myself as my husband was always working and the boys were tough to bring up. I found myself binge eating and drinking indoors. By the time my last born was 3, the doctors were so worried that i will not make it. They suggested a gastric band. It was extremely painful operation but now i am a pretty size 12 and even husband cannot get enough of me. The problem is that my 18 year old daughter in University is now very much obese and any time i ask that she does excercise or diet, she cannot manage. I have just decided to pay for her operation too. If she has the gastric band, she might even has a chance of getting a boyfriend. I am just scared she will not make it because i know i was lucky! should i let her have it?