How do I prepare my child for her new sibling?

When I found out I was pregnant, I had asked if my daughter wanted a sibling and she had asked for a sister to play My Little Ponies with. I told her that if she behaves, perhaps I'll grow one in my tummy for her and she got really excited and even started naming the baby. When we found out about the baby's gender, a boy instead, I had told her that she wouldn't have to share her Ponies since it's a boy and she made me buy a toy car that very day itself! As the weeks go by, I started asking her if she's excited, if she would show off her brother, if she will help care for her brother and when the day itself came, she was nothing but full with love. 7 months on and she's the most fiercely protective big sister that I've ever seen.