Well, because blogger won't let me post a reply on your blog post for some obscure reason, I'll just have to post it here instead...
Something like that sounds like a good idea. Perhaps a carapace growing from her skin? Maybe turn her forearms and forelegs into more exoskeletal limbs?
I've compiled a few reference pictures that might be able to inspire you or give you a few ideas.
I might even take a crack at a concept sketch for this myself and send it to you. The femme fatalle / mantis idea is brilliant.