not all HPR go into the classic pose of front or rear paw lifted, alot will just freeze wtih all 4 feet on the ground.
if the game is not sitting tight and is moving the dog may well be trying to stay in contact with the game by moving with it. you would need to have some caged game hidden, and work her up to it if she slows and stops once she can take in the scent praise her quietly and let her know you are pleased, hopefully she will do this more often knowing it is behavour you want.
you need to learn to read your dog and know how it behaves around game, and its mannerisms
a wing on a fishing line, can encourage the dog to chase it is normally only used for puppies, and they point more of a cautiousness than anything it is known as sight pointing, not scent pointing which is what you are after.
only put a dog in a hide if you are sure it is 100% ok in confined space with shots,
jan