Tris wasn't your typical geeky nerd. She didn't back down from a challenge or a fight. When she is almost rejected by her mate she decides to leave. When she returns she has changed. Geeky no more. She wasn't the weak thing her mate had shoved away and he can't help but notice that. She won't just run into his open arms though. Tris just wants to show everyone that she hasn't changed a bit they just care enough to see the true her in the beginning.