How to stop my daughter laughing at me?

she is 14, If I drop something she points and laughs at me, Anything I do she is laughing and smirking away at me and I just want to scream, I slapped her across the face last time and now she is smirking to herself quietly but she is still doing it. I'm not even that funny! If I make a mistake she laughs at me and it hurts. Should I have her sleep in the shed?