Hi and welcome to YT

.
First, PLEASE STOP THE HITTING of this poor little one. Abuse/hitting/spanking will only make it worse, so that's probably already damaged her training, learning, and comprehension right there. Hitting does absolutely nothing except confuse and scare them - which hugely impacts their ability to learn.
Read the sticky threads in this section:
General Training Questions - YorkieTalk.com Forums - Yorkshire Terrier Community