Actually, part of training a horse to hobbles would be asking it to move, letting it feel what the hobbles feel like and how to move in the way that works. Hobbles are designed to allow slow, careful movement, and if you are training the horse to hobbles, you might want to have them try moving in a controlled environment first, so that if they panick you can assist them to calm down and keep from hurting themselves. If they are never moved in hobbles, and they try it for the first time on their own and freak, that is not the time to feel out the boundaries of what hobbles are. I am not saying lunge them but ask them to move a little, or make a small commossion so that they move on their own, and they learn how much they can move and how to do it.
OP, if your horse is well behaved only when doing things that she wants to, then you will need to open her horizons some , too. Most horses don't want to work, or lunge or do dressage or whatever, until we convince them that doing these things is actually easier for them than not doing them. That means that if your horse is nasty about it, you have to knock that right out her thinking.
If you are lunging her, and she kicks out at you, then snake the rope right out at her and get her bum going forward. If she bucks, let her, but only in the round pen or on the lunge, and don't make her bucking behaviour change your demands on her even one bit. You said "go forward!" she bucked or kicked out or pinned her ears. Who cares? you keep insisting she go forward, ignore her opinion and get serious. Do whatever it takes to get the response and then let her have her opinion, but she must go forward.
It is not that she is over your experience level, but if you have conitinued bucking episodes, then you might need some outside help. No shame there.
AND, sudden bucking to me really does sound like a pain or tack issue.