Former psychiatric taken to combat?
What possible reason,other than to serve for the commercial aspects of the movie.She was in the movie/team just to make joker involved in the movie.
She is a lunatic,logically she would do more harm than be useful in this sort of combative mission.Although she does a good job,Joker+Harley would have been better in Solo Batman movie.that way,People wouldn't have been enraged by the lack of joker's screen time.
Deathstroke-he would have been great on this movie.