Maybe if you discipline the 14 month old when he hits, put him in time out or talk very sternly or something your daughter will see that its not ok to hit and there will be consequences. Maybe she will feel better about him because she will know that he's not getting away with it. She may be older than him but she's still a toddler and doesn't quite understand that she can't hit back because he's so much younger than her. But then again she may just be super girly like my niece, she does not like my nephew (her cousin) simply because he is a boy. She won't let him touch her toys or anything. She's just a silly kid. They will do what kids do.