Factual error: When the younger Brenner and Cooper are at the arcade, one of the games shown being played is Q*bert. Q*bert wasn't first released in the US until October 1982 and at the end of the scene, Cooper shows Brenner a paper for an upcoming arcade game championships dated July 26th 1982.
Pixels (2015)
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Directed by: Chris Columbus
Starring: Adam Sandler, Sean Bean, Peter Dinklage, Michelle Monaghan
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Trivia: Futurama's "Anthology of Interest II" episode contained a segment called "Raiders of the Lost Arcade" where Fry asks what would happen if life was more like a video game. In the segment, video games come to life and attack Earth, and it's up to Fry to save the day because of his video game playing skills. Billy West, who voices Fry, later performed voices in "Pixels", which was based on this premise.
Answer: She was a pixel but turned into an ordinary person. Probably to make the fight look epic.