A punishment spanking is often more filled with ritual than most any other scene and draws very much on her anticipation of an event that she knows will be a test and challenge to her.
Sending to her room to await you should excite her greatly even though she knows the spanking may not be that enjoyable. Making *her* fetch the implement used in her correction is an added erotic embarrassment. You may want to have her strip in advance and go to the corner to reflect upon her infraction and what steps she is going to take in the future to avoid a similar lapse. Or, you may want to have her place herself face down on the bed with a pillow under her hips and paddle beside her. If you want to see just how exciting the anticipation of a punishment can be, have her wait at least 10 minutes before you come into the room and then check her for wetness.