I figured she'd run back in when I scooted by her to go get the camera, but she didn't. She explored for a few brief moments until she found a good patch of grass to munch, then settled down for a snack. When it was time to go back in, she ran back in with the boys.
Unfortunately though, unlike her brothers, this cat can run - so if she decides to get too brave.... I'm going to have to keep an eye on her.