THat is a good tip, JEM. My daugther has the problem with tightness with landing. She either lands on her behind or she has a big step, she doesn't do her handspring over horse/pegasus with bend legs too, and it is because she doesn't have natural tightness. So if you have any more tips, maybe shown in pictures even, I can do them with her.
Landing is a pretty easy thing to fix, however if a skill isnt done properly landings are always going to be off. To work landings I stack LOTS of boxes up ontop of each other and the girls have to climb up and do a straight jump off with a tight landing, this gets them used to coming down from a height (such as beam) or from a skill like a layout etc and having a tight landing (absorbing the power instead of letting the power have them landing on their butts). I also test their landing shape I say everyone show me the shape you should land in and then you push down on their hips trying to push their butt to the floor, if it is tight they wont move but if they dont understand the whole power absorbing thing they will fall. If they can do this get them doing basic things saying use ur tight landing and when they land test it etc.
To fix your daughters handspring if she has bent legs it seems she would need to work just basic handspring drills which are pretty simple also, some can be done at home very easily. She needs to be taught heal drive which is the key to a straight legged vault in my opinion. heal drive is in basic words kicking ur heals, as soon as u jump on the board heal drive is wat gets you into the handstand etc so if she is in a tuck she has no heal drive and is using tuck to get her over.
Basic heal drive drills would be: stack boxes up to about her shoulder hieght and put a board infront, starting with feet on board and hands on boxes they have to jump their heals to handstand (u dont want to see a pike shape, or bottoms being used to get the handstand, u want to see their heals leading) and they just repeat this over and over. You can do that one at home with hands on any sort of higher surface (like a chair) and feet on floor aslong as its soft.
another drill is cat springs but they are hard to explain, i will try my best. its done on floor and basically its jumping from feet to hands they start in front support and with hands on floor jump their feet into an 'open' shape' if any1 can tell me how to put pictures here i will draw u a picture.
This post is getting long but i have a lot more haha.
Instead of having the girls work vault over the horse, maybe the coach needs to go back a step and work it over boxes, this is much less scary than the huge vault infront of them and they are more likely to use correct shapes. Also the way I got my level 4s going over the vault was simply putting 3 crash mats ontop of each other and vaulting using this not the vault. I could not believe how this fixed 1 of the girls vaults! They also land on their back here so works correct shapes coming off etc. I hav lots of photos to attach for u if someone could let me know how.
This is SOOOO long. anymore questions just ask. OH also work alot of handstands because vault is a hanstand and certainly not a tuck handstand, sometimes kids dont understand that their basic shapes are wat they need to use in their skill, its easy really, maybe being told that would help?