A new player was added to my leader board, she is level 1405. Why?

If you add any new FB friends recently and they play JJ, they will appear on your leaderboard if they have played that scene. If you tap on their picture, it will bring up their island name and their FB name as you know them. Also all players on your team will appear on your leaderboard, as long as they have played that scene.

If you are asking about their level, the maximum level at this time is 1475, which corresponds to the end of Volume 6. However, they can only play the scenes that have been released. Scenes 1311-1315 were released Thurs, July 14, 2022. One chapter (5 hidden object scenes and 1 adventure scene) is released every Thursday. That 1400-level player will be ready to play the next chapters (no need to add more flowers) as soon as they are released.