I get her point, but she is also quite wrong on some level. The notion that cops should only initiate the use of force in response to some other force or violent act is wrong. The state has the right to use force and coercion to enforce the laws of the land, even if those disobeying are not acting violently or dangerously. The question of the validity of certain laws is another matter entirely, but that's different topic. Think of things like forced evictions for non payment of rent, arrest of "non violent" drug dealers.
Her questions are valid, but some of her assumptions are way off.