The Case of the 27 Knife Stabs

In an alley, a weak woman stabbed a strong man 27 times with a knife and was arrested on the spot. However, there were no signs of struggling at the scene, it was strangely calm. The murderer faced the policeman’s questioning with pure puzzlement, she seemed like she just woke up from a dream. She said she didn’t know anything, she only remembered painting at home…

What the hell happened?