They hate because they fear or is it they fear because they hate? What came first, the chicken or the egg? Circular rationale is about as consuming as circular firing squads.
They just hate. They think she’s ignorant, uneducated, and dangerous. If you mean they fear the depth of those traits, that could be true, but they don’t fear her in the sense of a worthy opponent.
I should probably make it clear that underestimating her is their mistake.