OK, here is the issue. i have a student, who is very athletic and LOVES tennis. She has been taking private lessons for about 5 weeks now (she is basically a beginner). i have taught her topspin and hits the ball beautifully when i 1.) drop the ball in front of her, and 2.) toss the ball to her over the net. However, when i feed the ball with my racket, or hit topspin TO her when we rally she struggles so much and her topspin suffers. i know it's because she isn't used to the pace and she hits it late, but i am not quite sure how to fix this problem... Any suggestions to make her stronger. With some of my students i have them hit the ball out of the air as hard as they can, and that helps a lot re: their depth and speed of the ball, but are there any other drills i could do?