[U of M Sam]

My thoughts:
It sounds like the catcher "removes" her mask on every hit ball which, to me, is her "habit". Possibly try to avoid the mask as you should be moving on every hit ball. I usually would not say anything to the catcher and would inform the coach about the situation if I deemed it intentional. Players do not like to be "coached" by umpires.
Also, what age group?