What is Katherine like from the book Found by Margaret Peterson Haddix?

Katherine is a 12 year old girl from the 21st century. She contains a lot of attitude, especially towards her big brother Jonah. Katherine is strong minded and determined.

In the book "Sent" by Margaret Peterson Haddix, you find that Katherine like Chip and that she is very defensive,

In my opinion, Katherine is very brave for doing what she does.