Who is Laura Morrill from Fog Magic and what is their importance?

When Greta ventures into the magical fog and finds the community of Blue Cove, a series of fishing villages on the other side of the mountain from her town of Little Village, a whole new world opens up to her. The first family she meets is the Morrill family. Retha Morrill is close in age to Greta and they form an easy, natural friendship. From the moment Laura Morrill first sees Greta, she seems to know her immediately. Greta feels an immediate affinity to Laura Morrill. Laura is always so kind and thoughtful to Greta, always asking her to please come back soon and often. The first time Greta is there, Laura Morrill gives her a piece of strawberry pie to take home with her in her berry picking pail. By the time Greta gets home, the pie has disappeared.