My girlfriend scratched my face yesterday, is it accidental or intentional?

My girlfriend and I were on the bus yesterday. We sat next to each other and she put her head on my shoulder. I placed one of my hand on her head and suddenly, she raised her hand to the top of her head and scratched my face. It was a long scratch, about an inch long. She claimed that it was an accident. But my gut tells me that it was intentional. What do you think?
My girlfriend scratched my face yesterday, is it accidental or intentional?
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