marsha yumi perry , 36 , of washougal , washington was arrested on friday .
police dog tracked her sent through a field coming within feet of the hole .
officer kyle day gave warning he was about to unleash the dog when ` the ground moved and she sat up ' , police said .
boy suffered cut to his face and scrapes to his knees and elbows .
perry was arrested on felony hit-and-run , driving with a suspended license and on a misdemeanor warrant .