I read this as a young adult (I was born in 1976). It was a beautiful novel about a girl who grew up in the forest with little / no interaction with the outside world. I remember she had a vivid imagination and maybe had a magical lake or bog she would visit. She meets someone from the “city” and they fall in love. I seem to remember he gave her gloves and she didn’t know what gloves were. I now have teenage daughters and would love to share this novel with them.
I’ve done a lot of searching with the words girl, lost, forest, tree but can’t seem to figure it out.