Okay, I made the following changes:

"going to" -> "gonna"

"Besides we'll" -> "Besides, we'll"

I also ended up going with "Terminate her... immediately."

EDIT: And I've finally convinced myself that "Hell" should be capitalized in ESB. Sure it's "just an expression" long-divorced from its mythological roots (especially in this universe spoken by this character in particular!), but nevertheless it's a proper place name being used as a place and not just an interjection. So capitalized it is!