Inform your ill-mannered submissive that you will be ignoring all her messages and emails until she writes you a 2000 word document explaining why she has been acting so poorly. She should also include how she thinks she should be treated when you see her (if your relationship is partially r/t).

You, of course, should not even bother to read the part about how she should be punished in real life, because she's going to write something she wants to happen. You should do something you know very well she won't like at all.

Why punish the body when you can punish the mind intead. It's so much more effective when you're apart. Just don't let mental punishments become forms of manipulation. That would be bad.