I think they sense the change and will adjust with you. Just make sure you include her in your baby prep. Let her get used to the new stuff, the smells of baby wipes and powder, etc. Don't let yourself get so wrapped up in baby that you forget her. Make special time for her before baby but also after. So many go by the wayside when a baby comes and it doesn't have to be that way. If you always include her she will make the adjustment and make a great companion to your new family member.