this is pretty good, she wins in the end. I know that DUI checkpoints have been upheld in Calif courts, but I am not sure if the same has been done for compulsory ID checks. She said there was no probable cause for them to demand id, and she refused to show it. Hence that is probably why they let her go.
....and perhaps even worse than their actions, the cops simply do not see or understand that they are acting in derogation of the Constitution. They have been successfully immersed in The State and probably are lost forever.