Her knees are too low in the jumping pics. You seem to be a bit off balance riding - you have a very straight leg that's out in front of you and your heels are up quite a bit - that can contribute to her posture over jumps. She looks like she is struggling over the jump and using her neck a lot. Maybe do smaller jumps? Lots of gymnastics to get her knees up and get her better over fences?
For you, heels down, legs under you, shorten your stirrups and give more release over jumps. Very cute pony, and you guys seem to enjoy riding together. Just need to go back to some basics and you guys will be great!
Great thanks :) That jump was pretty small.. about 2 and a half feet, but thank you for help :) I shall defiantly try. Im going out to get a riser pad for my saddle as the cantle is sitting really high and tipping me forwards. This may be also contributing to me putting my legs forward. I must remember to shorten my stirrups :p forgot last night. *shakes head.. silly me.
Conformation wise, she's great; barely cow-hocked, and that's rare. In the pictures of you jumping, the only thing I can see is that you need to move your hands back a little bit, more towards the middle of her neck, and don't lean on her neck as much. You're not bad with it as it is, but just to be safe. That's about it. :)
Your stirrups are wayyyy long. You need to raise them a good hole or two. When sitting in the saddle and your legs loosely hanging down, the iron should hit your ankle bone. Focus on getting your legs underneath your body.
Also, lift your hands up, they appear to be in your lap a little bit.
She's a pretty horse :)