Congratulations on the happy coming event! Dolls can be tremendously helpful to you in preparing your daughter to become a great older sister. You can use the dolls and accessories to show her how to care for a baby, but also how to change the baby, how to appropriately touch and wash the baby, how to put her to bed and all those other baby activities. Once the baby arrives, you can keep your daughter involved in caring for her doll alongside you as you take care of the new arrival. This would help her to feel like she is part of your life and the baby’s life. That should head jealousy issues off at the pass.