I believe that Karana should have jumped rather than stayed on the boat. I think this because it shows her love for her brother, secondly she does it because she feels like she has to protect her younger brother and lastly it is an unselfish act to do.
Firstly, Karana should jump because it shows she loves her brother. The thought going through her mind was that she should jump for your younger brother. The love that Karana and her younger brother had for one another should make her jump. For example in a situation like Karana's it is the right thing to go back for her little brother, Karana was going through painful thoughts like the thoughts that her little brother may die. This would make anyone jump.
Secondly, she does this because she feels the need to protect her younger brother. Karana is the type of person who would do anything if she had a older or younger sibling in danger or wounded. So in this type of situation in which her younger brother needs a big sisters help, Karana would be doing anything possible to get to her little brother like jumping off the boat.
I felt as if I had been gone a long time as I stood there looking down from the high rock. I was happy to be home. Everything I saw- the otter playing in the kelp, the rings of foam around the rocks guarding the harbour, the gulls flying, the tides moving past the sandpit filled me with happiness. A qoute from the novel. (Scott O'Dell)
Finally, it was an unselfish act towards her brother. Because if Karana did not have jumped her younger brother would've felt useless with nothing to live for and unfortunately killed himself. Even if Karana hadn't of jumped she would have felt selfish and she would have lost all the love and sympathy that her brother had for her. The love that they had for each other drove Karana to do the most unselfish and Christian act that any human would be able to do.
In conclusion, Karana did what was best for her and...