Sometimes when I'm mounting Jubilee, she walks away from me. Or the moment I get on, she takes off walking, instead of waiting for me to put my feet properly in the stirrups and take up the reins. I know she knows better because she does occasionally stand still. And she's just too well trained in dressage and English in general not to know better (not by me, lol). She's just being dorky.
How can I fix this and get her to respect me by standing still patiently??