Дочка 7 месяцев: как отучить от постоянного внимания мамы? Советы, чтобы оставить с другими без слез

My 7 month old daughter is so clingy! She always wants me. I literally left her with my sister in law for one hour and she cried her eyes out. At first she was ok but then 10-15 mins later she was crying on and off. Has anyone got any suggestions to help her and leave her for a few hours without her crying ??