Lea Atwal I have never had a problem with any of my horses stopping after the jump, you only do it until the horse stops taking off and when he can stop without a problem you can either just make him trot after the jump or he should learn not to take off, it's a technique I learnt at a clinic
Pole work, grids, one thing I do is grab 2 jumps (or more if you like) a few strides apart and make your horse stop after the first jump before he jumps the 2nd jump, he's not allowed to do the second jump until he stops before it
Keep her at a trot and make long big slow posts over a pole and jump, keep the pole at least a 1 or a half a strid b4 the pole, you could even put 2 trot poles b4 it, then as she gets better make them canter stides
Do lots of halting transitions and downward transitions. Once your horse is listening try halting a little while after the jump and try to stop straight from the jump. Also time with this will teach the horse they don't have to rush!