[PW] help me remember the title and/or author of book

[cmontalvo at rgv.rr.com]

I am looking for the title and/or the author of a paperback book I read several years ago- before 2005. I am hoping someone “out there” can help. The story is about a busy city family of four that goes to a lake or beach house. It is the Dad's birthday I think and they go out for a sail to celebrate. A storm rolls in and they "lose" their teenage daughter. Presumed drowned, she has actually run away and is living with an artist in the local area. She is a “wanna be” artist and her family doesn’t approve. They close up the house and don’t return for quite some time. When they do return it is because their son is going to die and asks to go there. After they arrive they begin to find clues that she is still around - a certain flower is left on the porch, an unfinished bench she and her Dad were building is finished. I don't remember what the cover looked like. I feel like the title MAY HAVE had either the word Flower or the specific flower (like iris or lily) in it. I feel like the title MAY HAVE had the girls name in it too. Does this story ring any bells?