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Rita Tannenbaum was a Starfleet officer who served aboard Deep Space 9 and the USS Defiant in the 2370s.
In 2373, the Defiant entered the atmosphere of a planet (later named "Gaia"), and discovered a settlement of their descendants from an alternate timeline. In the alternate timeline, the crew of the Defiant were sent back in time 200 years, and stuck on the planet. In that alternate timeline, Rita Tannenbaum and Miles O'Brien (who'd finally came to terms that he'd never see his wife Keiko again) decided to marry, and have children. Among their descendants at the colony was a Miranda O'Brien. However, when the Defiant failed to go back in time and fulfill its "destiny", the colony presumably ceased to exist. (DS9: "Children of Time")
Off duty she visited Quark's when a grown up Molly O'Brien wounded the Markalian Madrat seriously by stabbing him a broken bottle into his chest. (DS9: "Time's Orphan")
In 2379, Tannenbaum attended the wedding of Commander William T. Riker and Deanna Troi in Alaska on Earth. She was talking to other guests and standing behind Guinan during Data's performance of "Blue Skies". (Star Trek Nemesis)