Also the cyborg what the hell, an interesting character and they told her story on the episode she dies.
With all that effort into makeup, why not tell back story in season one making a episode.for her.
When she died it's like so what, basically a red shirt.
There were originally supposed to be twice as many episodes, so they smooshed loads of storylines and ideas together. Dahj should probably have been around for about three episodes, we'd get to know her, and thus her death would have been more significant to the audience.