There are 2 things I would try on the heel. First when you call her to heel since she is only 8 months i would step back with my left leg and get her to follow it around and forward to the correct position sorts of open your left side of your body and draw her in to correct position. I would also reward by having the toy on the left other she will do the forging that she is doing now that you say she is doing. Also for the down I would call her to you or reward by going back and standing by her side. Not just always throw the ball and have her run for it. Throwing all the time unless you have freed her from the command can lead to problems later.