OK, didn't want to start the ghostown gunfight yet, but thought it would be the best way to find her. Thankfully the first person I now needed to see is her, and the map now told me where she was. :biggrin:
For some reason she has wandered off into the middle of the map, jut right after hidden valley. She's just standing there. :blink: hope she resets once the fight starts. I wonder who has been feeding her dog

Now off to go talk the rest into joining me.
Cheers all for suggestions!