Shakespeare's sonnets are written predominately in a meter called iambic pentameter, a rhyme scheme in which each sonnet line consists of ten syllables.
She knows that if she attempts to, by claiming that they were faking the whole time, the others would unite against her and could claim that she (Mary Warren) was a witch
Well I mean it is a poet, but it could be a child of the future poet since it's written in past tense