Oh vair oh is absolutely right, she isn't respecting you, so has learned to just tune you out - peck peck peck is all she feels, and could care less. So you need to ask once, then BAM! - give her a reason to listen the first time.
Pokey horses can become extremely dead sided very quickly, so you need to up your game and enforce your cues. They aren't requests... they are demands - treat them as such.
There is no passion to be found playing small - in settling for a life that is less than the one you are capable of living. - Nelson Mandela