Gileth watches the fruit tree farming patch at the Tree Gnome Village. You can use her as one of the five gardeners during the A Fairy Tale Part I quest. She can be easily reached by using Spirit Trees to get to the Tree Gnome Village and then talking to Elkoy who will lead you out of the village.
Gileth also sells basic farming tools, which can be accessed by talking to her and asking Can you sell me something? It is not an actual shop and it has no set stock; each item has to be bought individually through the dialogue.