Hmmm realized that I seem to have contradicted myself. What I mean is that I don't use punishments unless there is a reason for it that can't be dealt with in any other way. Then it will not be physical or what she may like in play but much harder to make it punishment. This will create a fear of the play level. I remember one of the young Doms that wanted me to mentor him, he told me quite proudly that she had screwed up a task so he had her suck his cock as punishment.
Good lord don't ever do that again I told him. Same basic reason that you don't take play action she loves and make her connect it with punishment is the same that you don't have her do something you love as punishment.
So I don't play at punishment and when given it will hurt her but probably not physically or be something she hates doing anyway