movie needs more "show and tell"

I'm left unedified regarding some major plot elements due to meagre visual or verbal clues. The plot instead of being "fleshed out" was stripped to a bare skeleton. For one, what did happen to Renee? It was something horrible, surely, but then why not show it, so we can empathize along with Anne during her brutal act? Also, what was it that Anne saw in her husband's head wound that made her realize just then that Lou had killed him (again, knowing this would also help the viewer empathize with her brutality). I also feel, as someone previously had mentioned, that Renee's character goes from competent wise-for-her-age 13-yr-old to helpless hysterical girl. Also, what happened to the ranger caught in the wolf traps? His partner doesn't do anything at all to help him (surely she carried a trap opener in her truck, in the middle of bear territory!). He already seemed pretty weak and she's going to let him keep bleeding for at least another half-hour or more! And the wolf, he was actually a, red herring?