That's the thing about Jane though. She is projecting her own experiences with people onto everyone that she meets without thinking things will turn out different.



A) She killed herself because she saw herself as a burden to Clem and didn't want to die like Rebecca did



B) She placed her sister's demise on Sarah as she saw both of them as beyond help



C) It's possible she just assumed Kenny would break down from PTSD eventually considering she's run with other groups before.