"There is a bit of concern for a spectator up on the hill there," commentator Mark Richardson said at the time. "That went very quickly."
After completing the match, Phillips sprinted to the embankment to check on the girl.
Black Caps spin bowler Ish Sodhi said his teammate was concerned about her condition.
"We've seen it a few times now. It is so hard to manage, you almost have to have a barrier up in some certain areas where maybe children and people that are vulnerable can sit and be safer.
"GP hits the ball really hard. The young girl that was struck, thankfully at the moment is doing alright which is great to see. GP has obviously shown his concern out there and everyone else is inside so I think she's in the best hands at the moment."
New Zealand won the game by eight wickets after chasing down Bangladesh's 137/8 in the 18th over.
