bless her, she really does look like she's having fun!!
agree with the flash idea, she looks like she's trying hard not to listen in one of the pics! hee hee
only suggestions i have is to do plenty of canter work at home, if she feels like she's rushing then keep the canter but ride a circle, she'l have to re-balance herself so should slow down, keep riding the circle until you have the canter you want then go large, if she tanks off again then circle straight away. working her 'forward' through it will be much better then getting into a pulling match with her. it wont work instantly but eventually she should get the idea.
try and get her to as many shows as you can, even if it is just for a ride around, sounds like alot of it is to do with it all being a bit new and exciting. if you do go to compete then give her a good long warm up... get rid of some of the fizz!
good luck, she's a lovely pony! Jones xx