Several things - the first is that you need to get into the arena and shovel the sand that has built up around the sides so the going is level and will drain.
Second thing is that the horse is not always sound on the left rein. More than once she was on the nod.
Thirdly, she is not moving forward, she is bored with being chased around the same old circle.
Finally there is no way that I would ever lead a horse as you are leading her, no control if anything should happen.
She is a nice enough mare and obviously you do love her but, you need to learn how to make training interesting for her so she enjoys it too.
Liken it to a teacher at school. F they keep repeating the same lesson day after day you would soon be bored.