My mother in law is sooo mean to me!?

my husbands mother is cow 1/2! i never say anything to her because she's my husbands mother and i just don't bloody know how to be mean back! she bosses me abut like a slave shouts at me swears embarres me front of everybody including guests! she picks on my daughter and swears at her front of me... ok so u get the picture! anyway how do i say no to her? so she never does it again!