Actually, there *IS* a doujin series that has an alternate universe Nanoha show up in the main line and she beats the panties off of Nanoha, Fate and Vita while fighting them.
Of course, we later find out that THAT Nanoha had a REALLY crappy life.
It's called "Another Crisis".
She ends up taking the corrupted Reinforce into herself after accidentally killing Hayate, and before that, her powers activated by killing Yuuno, then she goes and kills Arf, Fate, Precia, the Arthra, and the Wolkenritter and just goes crazy.
Of course, we later find out that THAT Nanoha had a REALLY crappy life.
It's called "Another Crisis".
She ends up taking the corrupted Reinforce into herself after accidentally killing Hayate, and before that, her powers activated by killing Yuuno, then she goes and kills Arf, Fate, Precia, the Arthra, and the Wolkenritter and just goes crazy.