What quote can you use to prove this statement, "She would not last long in the arena even if people were not trying to kill her."?

This is said in an indirect way. Katniss is clearly worried about her little sister,

I protect Prim in every way I can, but I’m powerless against the reaping. The anguish I always feel when she’s in pain wells up in my chest and threatens to register on my (ace. I notice her blouse has pulled out of her skirt in the back again and force myself to stay calm. ch 1