I was reading through the responses that you recieved and I think many of the suggestions are good for a horse that likes to get quick to the jumps. Adding ground poles, aka trot poles, in front of the jump is great for getting your horse to stop getting quick and focus on what is going on.
While watching a George Morris clinic online something he said really stuck with me about jumping. If you're pulling on your reins enough to make your horse smile, you are pulling too much...he was referring to the couple of strides infront of a jump. I understand that half halts are necessary but remember to give your horse her head. Even though she is getting quick she needs to 're-learn' where her feet go herself. (You mentioned that she didn't jump for 2 months) The more you pull, the quicker she will get.
Sometimes when I ride a horse that likes to get quick, during trotting or cantering, I may just add a little jump in the flat work. This kind of catches them off guard. I don't do long runs to a jump and never a short short one either.
I also agree that if a horse is rushing to the jump I pull up and halt. I would then walk over the jump, obviously if it's small enough. Then halt on a straight line. I don't pull up right after the jump. I would do it about four strides away.
Remember that you have to be quick with your responses. If the quickness happens to the first jump, then thats when you need to change it up.
No hour of life is wasted that is spent in a saddle.
~ Winston Churchill