Grumpy...I agree with you in part, as it takes two to tango. I don't remember that she needed to be dragged, kicking and screaming onto the cross channel ferry. There is more than a touch of Romeo and Juliet in this story. But she was under the age that British law allows to run off with an older man, and the court had no choice in jailing Forrest.
It would appear that she is now estranged from her family, which must count as some punishment at least. What I am still not quite sure about is, what crime she has committed, in order to be "locked up " ?