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[Harry Potter] Did Umbridge know Voldemort was back? And if so, why did she refuse to actually teach defense against the dark arts?

I heard that she was actually aware of Voldemort coming back to life, but just denied it. If that is true, is there a more interesting reason for her doing this than just being incredibly stubborn?
gpt
I don’t think there’s any evidence that she believed that Voldemort was back. She didn’t teach her subject properly because she believed that Dumbledore was trying to build an indoctrinated wizard army to take on the Ministry. That’s explicitly the reason given in the books, and the irony was that Harry ended up starting a literal Dumbledore’s Army after she said that. She wasn’t being stubborn.

During book 5, the Ministry saw Dumbledore as a crackpot Alex Jones type demagogue using paranoid conspiracy theories about evil wizards to terrorize the public. That’s why Umbridge even got a job at Hogwarts, because the Ministry was trying to exert more control. The only reason she even ended up specifically with DADA is because that was the only open position.