So, you have a murderer, and she’s female, and you want to give her an original weapon… so you pick a knitting needle…
Part from the fact that having a woman killing with knitting needles might seem original only to the Bros… you should probably do some knitting before you put that in your WIP, or at least go feel the tips of those knitting needles in a knitting-needle-store.
You know, to figure out that the knitting-needle-manufacturers have since about the 1600s figured out that making the tips of those needles unnecessarily sharp, or sharp at all is not just dumb but likely also bad for business… not to mention bad for their Bros when they suggest knitting is woke, or something…
I.e. have great ideas, by all means…
Research them!