In the Battle Angel Alita manga, Woyomi was a baby when Alita and Dr. Ido, her mentor, first met her, and at the time, Woyomi had been adopted by the proprietor of the Bar Kansas.
Judging by the original source material, it sounds like Alita: Battle Angel might be taking some creative liberties with Lana Condor’s Woyomi for the sake of condensing the timeline.
As a teenager, Woyomi ran away from home, only to become more deeply embroiled in the story’s main events.
The manga, as well as its sequel Last Order, charted her growing up, to the point that she reached adulthood by the time this length story ended.