So her desire to see the corpse can be interpreted as her just wanting to find out who the victim was. It's ambiguous.
No it ain't. Look at the scene again. She gets off on it.
Happy endings in Noir don't always bother me. I had no problem with Fallen Angel, The Woman in the Window and Pickup on South Street. Here it didn't quite ring true to me.
Sounds interesting, what were the source-s of your print, DVD, online?