This is similar to what happened to me with the very first block I had (lumbar sympathetic block since my RSD was at the time only in my left ankle). My leg turned a deep red and got warmer...but my pain was not reduced. I was told since there was a change in temp and color that meant that the block was successful...but my pain was not reduced so that doctor did not want to do any more blocks. A year later I had to find a new doc when that doctor decided to retire and the new one wanted to do a series of blocks because he thought that the build up of the meds in my system would maybe reduce the pain. Don't lose hope though...this early on she definitely has a better chance for remission. Maybe the next time they will try a slightly different spot or slightly different meds/doses...and you may see better results.

How is everything else going? Is she doing any physical therapy, find a combinations of meds that help, etc? I know it is disappointing when you put so much faith in something and then having nothing to show for it. This was how I felt after that first block. I fought so hard with the insurance company to get it and then when I did...nothing. I actually cried right on the spot because I was so disappointed. But you just gotta keep focusing on the good things and know that if this doesn't work you're on to the next thing.

I to have bilateral lower extermity rsd and can say I have many lumbar sympthatetic blocks. none that last. But my foot turns bright red and warm, which gives me more ability to move.
My shots were all 2 to 3 weeks apart, until this last episode. We did one week apart and the first one I had no pain improvement the 2 I had minor improvement. The third one, I got to wear a real shoe for several days, with decreased pain.
Don't give up, try the series. Everything is still early. It would help if she was in occupational therapy.