Is it wrong to dislike your mother in law?

She needs to discuss this with her husband, and her husband needs to be supportive and speak with his mother. After all, it is his mother. She needs to explain to him, that although she is grateful that his mom wants to be involved in their child's life, that there are boundaries. That they are the parents, and if there is something the MIL doesn't like, she's more than willign to discuss it with them, but they still have the final say.