And I answered based on his previous comments.
Like you, he also doesn't know if she has a second account and where. He asked that in his first comment. In another comment he said "but ironically during her lazy free chat non-responsive sessions she'll have a nipslip or panty flash etc".
Since he saw that (I assume), and he doesn't know any other account besides the ones listed here, I can only guess that this happened on MyFreeCams, the only of the three sites that allow things like nipples and panty flash in free chat.
Not sure how much of this you consider nudity. Maybe the nipples. But panty flash isn't nudity. Maybe she does that only to tease and encourage people to go private, but then in private she is 100% non nude like you say.