u/Actual-Lavishness792

I was a young child when I started to read this book and did not finish it but can remember some details.
It pretty much starts with the main character, a young girl- maybe teenager, who moves to a beachside area with her mother and father. It’s a decently big house I remember but she meets a boy who lived nearby and worked for someone. They start to get along and hangout. But the one big thing I remember is when she is exploring the beach and finds a cave up above in the rocks. she goes up to check it out and gets stuck because of the tides and waves. After it calms down she’s able to get back home. And I think that’s where i stopped reading it.
I have been looking for years. I really want to find it again!!! Please help!