Vita Streck och Öjvind by Sara Lundberg (2011) is about a young girl who paints white lines. "Vita Streck" is Swedish for "white lines", according to a quick Google--and according to the yellow post-it note on the title page. The entire text of this book was covered with post it notes written in English. There's a mystery! Who provided the English translation, and who took it to the library book sale shelf?
The translation indicates that the girl's name is Vita. "Vita is someone who walks. Always forward and always painting her lines. The first illustration shows her painting white lines on an very long bridge that connects islands in a vast body of water. There are no cars on this bridge, but many sailboats dot the water. Suddenly she's visited by a young person who's blown by the wind into her can of white paint. This child's feet now create white footprints everywhere, and not in straight lines. They become friends as the visitor questions Vita about her line painting. When the wind blows this person away, Vita realizes her loneliness. When she searches for Öjvind, her lines go hear and there and all about. I didn't understand the ending, so I'll just say it's a happy one.