Whats this movie called?

Its about 2 girls. Ones a tomboy and ones a girl. And the girl thats a tomboy lives off in the mountains somewhere in the woods And her and the girl thats a tomboy goes on adventure but than the girl gets trapped in a water in a cave somewhere between 3 rocks and the girl thats a tomboy haz too go get help! Please tell me what this movies called thxxxxx :)