Why Four Coves When There Are Five?

In Chapter In Or Out?, of Sunrise On The Pier, Gabrielle stands on the post and rail fence and sees only four coves. How can that be when there are five coves at Skye Pointe?

From her perspective, she sees past Marina Cove to Coral Cove, Jasmine Cove, De La Croix Island and Keeper's Cove. In the distance, De La Croix Island appears to be the southern tip of Keeper's Cove. Instead, it is actually a barrier island that blocks Hidden Cove from view - unless the perspective is due east.