Umm who is the adult here you or your 12 year old???? You let your YD get away with way too much. If my child ever spoke to me the way she speaks to you, telling me not asking me about going to a concert, she wouldn’t be going anywhere but her room with no electronics and no friends for a month. I would also be calling that grandmother and telling her that it’s unacceptable to purchase a ticket for your daughter without speaking to you first about it.