Hi Marlene! So sorry about your daughter and the pain she is experiencing. I was 24 when first diagnosed and am now 46. I was initially diagnosed by a university hospital's pain clinic (anesthesiologist maybe?). When I had a new injury in 2009, which started the spread, that was diagnosed by a neurologist.
There are so many symptoms of RSD, and no two people are the same. Personally, I experience burning, sharp, shooting, stabbing pain... but it is not always burning and not always stabbing.
Your daughter needs to get a correct diagnosis so she can be treated asap. The best chance of remission is early treatment.
All the best,
Nanc