I'm so very sorry to hear about your daughter. I found out last August (after shuffling though doctors and physical therapy) that I had AVN in both hips and have now had both hips replaced. There are actually four stages of AVN (I was stage 4 - the end stage) and I think that might be a reason for you to seek out a second opinion. As other people have indicated, I would also be concerned about your daughter and her final "adult" growth and height and the proper timing. Sadly, it's not something that's going to go away or get better on it's own. It's probably a good idea to get a second (or even third) opinion if you can buy some time and your daughter is not severely compromised and/or in pain.