Would she normally go onto the naughty chair for taking her clothes off if she wasn't already on there? Is the issue that she is taking off her clothes because she should be just sitting in her chair, thinking? I don't actually use a naughty chair, so not sure what she should be doing when they are there - does her taking her clothes off change the discipline she is receiving? If it were me, I would just concentrate on one issue at a time and ignore the stuff she is doing on the chair. Maybe she might be ready to say sorry etc earlier then the 3 minutes.