SOLVED. I read this in middle school .about a girl on an island they eat lots of fish she hides in a cave behind a waterfall at some point. There are large cats? Possible Spoiler. [s]

[Calli]

It’s about a girl on an island they eat lots of fish she hides in a cave behind a waterfall at some point. There are large cats? and her brother also dies. I read it at some point between 2004-09

[[deleted user]]

Island of the Blue Dolphins

[Calli]

Yesss that’s it!! Thanks

[[deleted user]]

No problem. :)

[Lobstergirl, au gratin]

Plot details added to header. This could help anyone in the future looking for the same book.