First of all, Welcome to Bernertalk!
Have you EVER heard her bark??? I had a chow that only barked about 5 times in 13 years, so maybe she is just the quiet type???? lol Our Berner, Riley BARKS! but he also makes some crazy noises that sound like he is trying to talk too!
If you have never heard her bark before, ask you vet...maybe there is some medical reason that she cant actually make a barking sound. Maybe the noise you hear is her "bark".