Sorry for the late reply, but this might help other who wander across the posts researching.
sondra - I've had the surgery and it is so much easier than years ago - now they don't wire you shut for the healing period (confirm that with your surgeon before using him). The first few days are a little difficult, but they give you cool pain meds for that. Two weeks after surgery, you will feel great and want to go out and do things (actually you might hit that point after a week) ... just take it easy and be careful for 6-8 weeks until you bone is healed.
marzuqmn - I was wondering where you were reading things that did not make you happy about the procedure? Was it the person who said to avoid surgery at all costs? Her brother's condition does not sound severe as they got him edge to edge with the upper and lower teeth. But keep in mind, she is not the one with an underbite or overbite and she does not have to live with the results of her decision/opinion on the matter. When I was 16, I wore braces for 2 years to overcome an underbite - they should have done orthognathic surgery on my upper jaw, but my parents and dentist and orthodontist decided to flare my upper teeth forward and do a bridge of connected crowns for my upper front six teeth to give them support instead of doing it properly (upper jaw surgery) - so now that I am an adult, I have been in braces for 18 months reversing what they did when I was 16 and had the orthogathic done properly. I would say avoid surgery in third world countries at all costs, but in America this procedure is quite safe with an experienced orthognathic surgeon who does the operation regularly. I did my research also, and I mostly only found positive comments and positive results. What is the offset in the jaws that needs to be overcome? If they can get her teeth edge to edge without flaring her upper teeth forward at too great an angle, then that might work well. But if they could do that properly, they probably would have done that without much mention of orthognathic. Second opinions are always reassuring ... if you have any doubt that you are doing the right course of action, get a second opinion, and a third if needed. Just do what is right for your daughter the first time, whatever that may be

Good luck!