How has Katniss rebelled against the Capitol and why?

In the first book of the Hunger Games trilogy, it was not Katniss' intent to rebel against the Capitol. Neither she nor any of her friends in District 12 had any love for the government. The Capitol had kept very tight control over all the Districts since an uprising in District 13, including forcing all remaining twelve Districts to send two teenagers each to the Hunger Games each year--a fight to the death for all...

In the first book of the Hunger Games trilogy, it was not Katniss' intent to rebel against the Capitol. Neither she nor any of her friends in District 12 had any love for the government. The Capitol had kept very tight control over all the Districts since an uprising in District 13, including forcing all remaining twelve Districts to send two teenagers each to the Hunger Games each year--a fight to the death for all except one champion. Katniss, at 16, was the breadwinner for her mother, her younger sister Prim and herself; her hunting and trading are what fed them. She had no time for active rebellion. When Prim was selected as District 12's female "tribute", Katniss volunteered instead in order to save Prim. Once in the Games, she simply tried to keep herself alive. When the possibility that both Katniss and Peeta could survive when the rules changed, she worked for that. The Capitol again changed the rules once Katniss and Peeta were the two remaining tributes. Katniss' strategy of threatening no winners, by both eating the poison berries, worked--but made enemies of the Capitol. President Snow saw it as a deliberate ploy to disgrace the Capitol and himself, and saw Katniss as a rebel that had to be destroyed.