skye would try to kill rumlow in a heartbeat if she saw him, but chances are, she could not go toe-to-toe with him on her own. her powers are wonky and limited, and she still can't beat may, so.

since you mentioned handwaving coulson gathering the team in a plan, he could reasonably anticipate skye being stupid and let her get ahead of herself to be some kind of distraction piece and just silently plot for the big team-up to get the jump on rumlow when she does make a stupid move. i don't believe skye is considered mission-ready yet otherwise, but if she finds out rumlow killed a kid, she won't care.

IDK THROWS THIS OUT IN A PLACE WHERE YOU'LL BOTH GET THE NOTIF