I would just say make sure she knows she is loved and appreciated. Its hard because all the attention will be on the baby from you, from her, and from anyone else that comes around.

You know her best so make some special time for you and her. For my wife and myself we found special time during the odd hours of the night when baby was feeding to just sit and talk and be together even though we were exhausted.

It really is a magical time and sharing it together makes it even better.