The location under the bridge could be a place of isolation. It might signify that the girl is in a marginalized situation, away from the normal hustle and bustle of society.
The song 'Under the Bridge' by Red Hot Chili Peppers was inspired by Anthony Kiedis' real - life experiences. He was struggling with drug addiction at the time. The 'under the bridge' referred to a place in Los Angeles where he used to go to get away from his problems and think. It was a very personal and emotional song for him.
Well, if we consider a general 'under the bridge' full story, it might involve the history of the bridge itself. For example, the bridge was built many years ago, and over time, it became a gathering place for various groups. Some might be artists who find inspiration under the bridge's unique architecture. There could also be local legends associated with the bridge, like a ghost that is said to haunt the area under it.
I'm not entirely sure which specific 'Under the Bridge' you are referring to. There could be many works with this title. It could be a movie, a play, or something else. If it's a movie, you might need to check movie databases like IMDb to find the cast list.