Am I wrong to be annoyed?

My husband deploys soon so he won't be here for the birth of my daughter. His mother is wanting to buy thing for the baby but she's the type of person when she gets angry she will throw it in your face that she bought this or that. So I for one would rather buy the things on my own. She was asking my husband today what color our baby's crib was and I told him to tell her not to buy anything without letting me know because what if I didn't want that. Well he got mad and offended now he's not speaking to me. I'm just so annoyed she knows he won't be here to set the baby's room up why won't she ask me about it instead of him.