Not sure about opening times for Gladys - it is definitely open for lunch though.
Drive towards Cortecito: it's near the Carabela resort after the road curves sharply to the left at Plaza El Dorado/Plaza Turquesa/Los Corales.
Another highly recommended place for home-cooked Dominican food is Yeya at the Cocoloco crossing (next to El Pollo Borracho and the recently relocated car dealership).
Venezia is in the small mall between the Bibijagua turning and the Villas B?varo complex, shortly before Palma Real if you are driving from PCV.