I see now. For some inscrutible reason, she moved from her original position above her house to another one below it. However, I couldn't see her until I went around the corner of her house.

Sorry for the panic! I was worried I wouldn't be able to do her quest or buy the ever-useful charms! Thanks for your help "boing"!

"And still I could feel the serpent gnawing the roots of the sacred tree..."