Need a hand with ideas? She seems like an army type, or like a workshop girl getting that elbow grease flowin'. Just throwing out some ideas, got more than I can count on my fingers. I don't really have any left for now though.
Edit: Oh I was just making arm puns.
She seems like the type to be that type of sarcastic where you keep hinting at it until they get it.
"How'd you lose your arm?"
"How'd I lose my arm, you're asking?"
"Yeah"
"My arm that I had before joining the army?"
"Yeah!"
"Gee that's a great question."
"...Did you lose it in combat?"
"THEEEEERE IT IS. You get a big pat on the head! *wiggles arm as if patting them but there's no hand*"