Doroteha tells her that she is naked.

Manuella had always shown Dorothea so much kindness ever since she was a child. So she simply couldn't bare to see Manuella walking around without knowing her current state. She simply had to help her.

Dorothea walked up to Manuella and said "Umm, professor Manuella."

" Dorothea! What is it dear?" Manuella replied?"

"Haven't you been feeling... cold today?"

"Well, now that you mention it I have been feeling a breeze. But the summer season is over so it's not surprising."

"But... don't you think you are wearing very little clothes considering the season?"

"What do you mean dear? I put on a little less clothing than normally would. But I don't think outrageous"

"But Manuella. You are completely naked."

"Naked? Don't be ridiculous Dorothea. I'm pretty sure I would have noticed if I was walking around without any clothes on."

"No, I'm serious Manuella. Look down for a second."