I totally agree with Feralpeg. Please tell your daughter not to "force" her jaw into any position. It only causes it to get worse. Tmd (Tempromandibular disorder...NOT TMJ, which is the Tempromandibular joint itself) can be caused from a number of things ranging from an accident to the jaw, to grinding or clenching the teeth at night to a more serious disorder of the joint never forming correctely in the womb.
I have had TMD for 20 years. It was so bad 4 years ago that my jaw was in a locked position for over a year. I couldn't eat anything that was larger than the width of my index finger, because that was how big I could open my mouth. I went to 2 different chiropacters who tried to "force" my jaw into place. It was excrutiating. What they failed to realize was that they were making it worse. If they had done x-rays, they would have seen that my jaw on the left side is almost non-existant.
I finally went to see a specialist in the dental field. He fitted me with an appliance that was worn 24 hours a day, including eating and sleeping. I had to eat a soft diet and drank a lot of protein shakes during that time. After 6 months I was fitted with another appliance for nighttime use that goes over my top two teeth. I can now open my mouth wider than 4 fingers together.
I can honestly say that this Dentist saved my life. I had already told my Husband that I couldn't live another day in the pain I was in.
I'm sorry this is long, but feel it my duty to let people know that you don't have to have surgery to fix the problem. That is only reserved for the most serious issues, and if I can be helped, I know most people can.
Please find a dentist in your area that ia associated with the Academy of Pain Management, the American Board of Craniofacial pain and the American Board of Orofacial Pain.
PM me if you have further questions, I'd be happy to help others out.
Jo