you're luck they are giving her an inch!!!  thats more than i give when im defending...lol  if the GS is being double teamed just get her to relax and keep to the edge of the circle on the opposite side that the ball is coming down so that the circle is opened up for the GA to come in.  once they are in then the defence tends to go back to one on one or defending an area of the circle.  for face to face that leaves the defender completely unaware of where the ball is coming.  the GS needs to hold her ground, use her peripheral vision to watch the ball come down the court and then break at the last second for the pass.  

if the defender is blocking during a shot being taken they MUST give the shooter room to comfortably make a normal shooting action.  if the umpire is not calling them up for obstruction, then talk to the umpire about this during a break about the rule and if nothing is done then speak to the umpiring conveyor about this.

hope that helps.