If the writers were thoughtful, they could have explored it. Exploring the character and her figuring how the Federation could survive without having a cloak or discover whether she likes being a part of the Star Empire? She could've made a friend there, and saw where it went. These are elements for character development for something positive would be more appropriate for TOS, & TNG, not a War-happy show like DS9.What do you think?
It's a missed opportunity to bring a Romulan as a cast member, but screen time would be scarce. With all of the immaterial characters (Worf, Leeta, Vic, Rom, Martok, Weyoun -A great character- Demar, Eddington, Cassidy & Ezri clogging the show as was, there wouldn't be much space for her.