one method would be to give the player a second image point (on the players hand) so when you switch direction (and I am assuming here you are then mirroring the player and the bow ?) just move the bow to the player image point (hand).
Is the player static ? Have you looked at using pin ? Can you post the capx so we can see where you are at and perhaps give better suggestions for this ?
edit added capx - I bet there is a much smarter way (my excuse is I've not had any coffee yet)