I'm confused, has she forgot or has she changed her mind?

Well as many of the people in England and Wales know, most teachers are going on strike this Thursday. Yesterday (Monday) my teacher said to our class, that the teacher that teaches us on Thursdays and Fridays is going on strike with my class teacher so we're not going to school. But then today she was explaining what we're going to do this week (Because this week we're learning all about The Beatles) so like biographies and composing music and she said what we're doing on Thursday. I don't know if she's forgotten we're off on Thursday because she's on strike or she's changed her mind. Any one have ideas? (Don't worry I'm gonna ask her tomorrow, just wanna know your opinions.)