Because they are of the mentality of if you're not with us you're against us. She left so she needs to die.
She spoke in generalities because she didn't have proof, it was her gut feeling about the place. She said as much to Andrea, that's why Andrea didn't leave because she wanted proof not just a hunch. She didn't know about Penny, she never actually got the door open before the Governor, Merle, and the researcher walked in.
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