To do a successful BC ongoing, you need Dinah to have a strong supporting cast of her own, an arch enemy and have it's own unique style. Batman has his own moody, psychological, gothic atmosphere going on as well as wide tonal flexibility. GA has his own niche as a hot headed liberal and 'man of the people' aspect of his character. Dinah would need her own thing.
Shiva was the closest she had to arch enemy but she was more of a rival than an enemy and I'm iffy on Simone's Shiva anyway.
You would also need a consistent back story for her. IMO, her best backstory was her Post Crisis one; the mother-daughter legacy. I wouldn't mind some kind of modernization of her Golden Age stories. It's weird that she doesn't have much interaction with the Thunderbolts despite originating in Johnny Thunder's book.