I think it was me who said that
. It was something I noticed in some combo challenge videos; people didn't have to do the directional or an additional input to get into the stance. Examples of forced transitions would be 6H+K into Dragon Stance, PPP into Dragon Stance, 3K into Dokuritsu-Ho, 8P into Heichu, or 66P+K into Heichu. She even has setups in which she is forced to go into Hissatsu-no-Kamae (HNK) after moves like Dragon Stance P or Heichu P+K. My guess is that you can just strike punish her out of her stance just like you can strike punish Marie Rose's Rondo with anything but a mid punch or high punch. If you have a quick reaction time, you might even be able to throw punish her.
On the bright side, not all moves force her to transition into certain stance. 4K (from Zack) doesn't force her to go into 'Ducking' for example, for which an additional '2' input is required. Another advantage is that you don't have to input something extra, in case it is really your intention to transition into the desired stance.