Here are a couple of Youtube channels that you can find some interesting info on.
If she's rushing her fences you might find that going back to grid work will help - try working towards a line of bounce fences - only 2ft max where every other fence is actually a ground pole - makes the horses think about what they're doing. Also lots of twists and turns - avoid jumping single fences over and over again
This one is EventionTv, they have 43 videos at present
This one is from British Showjumping, they have 208 videos, a mix of instructional stuff and basic interest things like clips from competitions