Alternate timeline
(covers information from an alternate timeline)

In an alternate timeline, Miranda O'Brien was the descendant of Miles O'Brien and Rita Tannenbaum, officers from the USS Defiant. She lived on the planet Gaia with the rest of the descendants of Defiant's crash survivors.

In 2373, she welcomed Benjamin Sisko to the planet. She also helped tell the story of how they came to be there.

When Odo changed the flight plan of the Defiant to avoid the crash that would strand the crew and preserve this alternate timeline, Miranda was wiped out of existence along with the rest of the descendants. (DS9: "Children of Time")

Miranda O'Brien was played by actress Jennifer Parsons.
The costume worn by Parsons as O'Brien was sold off on the It's A Wrap! sale and auction on eBay. [1] [2]
According to the script, Miranda O'Brien was about forty years old, suggesting that she was born circa 2333, and was the elected leader of the community.
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