What episode is sara killed on? and what episodes does she get hurt on? plz help !!! thanx !

i know she got kidnapped and she was in Prison but what episode does they think she is dead and what other episodes does she get hurt on? and thanx!

Season 3, episode 3-Lincoln found "her head", Gretchen lied him it was Sarah. Except it, she was kidnapped by Kellerman in season2, episode 12, but she escaped. U are welcome!