LB, I hate to tell you but most frum people in Yerushalayim that I know do not use Craigslist, perhaps they do in Tel Aviv, but I think you’re targeting the wrong crowd by thinking of Craigslist.
Is there some way to identify her from the camera? People could have as the first picture on their memory card a picture of a paper with their name and contact information on it if they wish not to lose their cards forever. One time my daughter found a memory card at the beach in Ashdod along with some kind of electronic device (perhaps an MP3 player), and there was contact information available and she was able to contact the people to let them know she had found it.
She could contact the Yated (Hebrew edition) and put a note in the pages that they have at the back of the weekly paper that is distributed. Other similar media would perhaps yield results.