Hi and welcome,
One of our members, who lives in your area, has had her dogs seen and operated on by an orthopedic surgeon out there with whom she was very happy. There are others in Southern California who may be able to give you their experiences also. We cannot give out names of providers in a public thread but people could send you recommendations in a private message. The thing is, you need to have 5 or 10 posts in order to receive private messages from members. You can get your post numbers up quickly by playing some of the games in Fun Stuff or welcoming other new members. I think costs vary regionally so I don't know how those prices measure up. I spent about that for an initial consultation with an orthopedic surgeon in Maryland, I think the surgery here for elbow dysplasia would have been a bit less.
I hope you can find some help for your girl!