Really good effort given the circumstances. Yes, your mare isn't as fluid as she probably could be, but she was obedient. Be careful you don't counterflex her too much, it is a useful tool, especially when working on connection, but judges really look for straightness.
Encourage your mare to lower her head and neck, it will help free up the base of her neck and allow for more freedom through her shoulders.
Great effort though, winter schooling shows are tough. I tend to avoid them as most of our local ones do not allow for the adequate warmup of the horse and rider.