Leah saw a tasty treat, decided this was a good time to practice rock climbing to get at the treat. She doesn't want to rely on the farmer she there's something she wants but just can't quite reach!
Upon closer examination, there's something under her feet, like a mini-elevator or something. Maybe she talked to the Wizard about a flying Roomba?
I posted a near identical picture not that long ago!! The SAME thing happened to me. Also I got a Leah clone! There was two of her in my villager status bar.
Well, that explains it. Clearly, what happened was she made a statue of herself (a sort of sculptor's self-portrait), but it came to life Pygmalion-style. Unfortunately, it realized that it's just stone, and is trying to return to the rocks from whence it came.
I had a same issue with Alex! Although he was at the Bus area, inbetween that gap in the wooden fence, and when I talked to him, he said he bought some new shorts lmao