mu4scott - I think it all depends on her reason for the verbal count. When she gets to five is she wanting you to call the violation or does she continue to count past five to rush the thrower into a bad throw?

If she is attempting to "assist" you in your five second count, I believe that is unsporting. I would probably let her &/or her coach know that is not appropriate & any further related action will be penalized accordingly.

Just my opinion though...