She is riding with her stirrups *much too long* - like 3 or 4 holes. Once her stirrup is shorter, she should be able to sink some weight in her heel and close her leg around the horse.
Other than that, she's sitting up with a flat, relaxed back and looking where she's going. Her hand and arm are in the correct position with thumbs up, elbows at her side and a straight line from bit to elbow. However, she's somewhere between loose reins and light contact, and needs to pick one or the other.
Horse seems to be moving forward actively.
Fix the stirrup and lower leg and it will be a nice picture.
For a confo critique, it would be best to post actual confo photos.