I would maybe change “kill the girl” to something along the lines of “the girl is the only one standing in your way” to communicate that Palpatine doesn’t want Rey dead as much as he wants to make Kylo THINK that he’s got a chance of becoming Emperor himself. I don’t know if that makes sense, it took way too long for me to put into words. Basically, I’m saying that leaving the line vague might make it clearer to the audience that Palpatine’s doing another 4D chess reverse psychology plot.