When a horse disconnects in the canter they have generally been thrown off balance. When you ask for collection, what exactly do you do? When she has tucked her nose in, is she evading the bit AND on the forehand or simply evading? If she is on the forehand, half halting will/should bring her back to you and begin to collect her. I suspect she is a bit uneasy to balance and may still be a bit under developed in her haunches. I suggest numerous transitions and circles. Uphill work will also do wonders as well.
I can only see one photo that ur heels don't look down but because of the darkness of the horse its hard to see but like kyia said photos don't show what happened a second later! You look great on a horse! Apart from the things you mentioned!
Oh thank you!! My mare and I have come on huge amounts since I put these pics on!
We have done 3 dressage tests, 1 pre lim and two novice and had no less than 68% and came 1st in the prelim with a whopping 74%! Hehe hence moving up to trying novice tests! Hehe
We have also been to a cross country course in lincomb twice and gone from jumping tiny logs and walking into the water too jumping 3ft BE novice fences! She's ACE!! And loves every second! (only have videos of her and they are stuck on the camera but will try and get some pics up!