Positioning Problem

[Rookie]

I have run into this situation two or three times this year.

As the trail, there is always an opportunity for a player to shoot a three right in front of you, and not allow a good line of vision to see if her feet were behind the line. If a player is to my side, I will try to move down, but last night she dribbled right in front of me and did not allow an opportunity for me to re-position before she shot it.

Am I doing something wrong?