Very hard to get lunging photos on your own, but if she works like that all the time, things need to change. She's very jammed up and short in the neck, sucking back off the bridle. As such, she has hollowed and stiffened her back, the strides have become short and choppy. Basically, she's not working any muscles worth working, and will develop undermuscle and possible soreness through the joints and back due to the jarring motion of her strides.
I would REALLY like to see her allowed to bring her neck longer, stretch from the wither down and forwards, and sent forward until she unlocks her back. Then and only then will you make progress.