You could buy her a tshirt saying she's going to be a big sister
I would take her to your next ultra sound. Include her in this as much as possible. My daughter is 5 and before she started school I involved her in every doctors appointment. My 20 week ultra sound I thought she was going to miss but I got lucky they were out for parent teacher meeting so she got to go and see her little brother, hear his heart, and find out he was a boy. It was an amazing experience. She wanted a sister so bad so when the ultra sound tech said boy her reaction was priceless. Kids like being involved. Take her when you do your registries and let her help pick stuff out and then after your done with that make the rest of the day about her. Like a lunch date, movie, or having nails done.
Hi there. How do you think she is going to take it? Hopefully she will be overjoyed. However, sometimes kids feel secretly jealous about it. Even at that age. Especially at that age. They are in that tweener world where they struggle with being grown up and still a little kid and they have hormones and are generally growing through a lot. Add in if they aren't with dad all the time and maybe sometimes feel a little bad about that . . . I'd tread lightly until you can gage her response. Just being honest. She may need hugs and discussion that she is still daddy's baby and still important. :>)
I wouldn't give her shoes as the above poster says. I'd give her a present SHE will like and say "from your baby sibling" as the surprise. Sends a message that it isn't all about the baby. good luck
U should make it something special for her ie something saying "you're going to be a big sister!" Make it a present for her as baby shoes would be for the baby. Just an idea you don't want her feeling pushed aside or left out