both would be correct, if you are talking about a single person, then she is right. if talking in general about women the they would be correct.

Since it's imperative, I'd say you're missing a dot between ''Respect every woman'' and ''even if they are prostitutes.'' like that -­--- Respect every woman. Even if they are prostitutes. Otherwise you could consider adding ''You should'' at the start of your sentence. A) is correct if you're talking about 1 woman as an example B) is as a generalisation