looking for name of riding club in CA

I know this is a shot in the dark but I was looking for the name of a riding club I read about in a magazine about a month or so ago.

It was for adult women
It was out of CA
The story was about how they trailered through several states to ride in Yellowstone(?)

I keep thinking the name is firefly or something like that but I would like to find more information about them.

TIA