I love my friend but she is so annoying and bratty?

She ALWAYS has to be right. Even if she knows shes wrong, she will eventually hit you if you dont say "okay, youre right". She will buy things I want just to say "I got these, I know you wanted them"with a smug smile. She also acts so much smarter and better in general than me- she goes around saying "F*** you!" if someone mentions her ex because she was soo in love with him, but if I say I like someone she tells me Im just confused (shes a year older). Its getting hard to deal with her, Im tired of her acting like shes the all knowing boss of me! Does anyone know how to deal with her?