Becky

Becky was a clone created by the Umbrella Corporation as the Red Queen took over. Becky was one of many clones that shared the same unnamed progenitor, each having unique experiences in Umbrella Prime's environmental tests.

History
Becky was created with little actual memories, like all of Umbrella's clones. She did, however, have enough to project "the right responses" during the tests. As such, she willingly accepted "Todd" and "Alice" as her parents, with all three ingorant towards their lack of actual memories. Living a comfortable life in suburban Raccoon City (actually the "Suburbia" test-zone), her family was skilled at sign language, despite appearing to have excellent hearing.

As the test simulation began, Alice, Todd, and Becky woke up late for their appointments (work and school, respectively). While eating breakfast, they were attacked by the newly-arrived Las Plagas Undead, with her father seemingly being killed. She and her "mother" managed to escape into the streets where they were offered help by a clone of Rain. When the car was hit by a truck, they were forced to run again, believing Rain to have been killed.

The "mother" and "daughter" found momentary refuge in a ransacked house and hid in a closet from an undead who followed them to the second floor. Alice attacked the zombie, instructing Becky to hide elsewhere. Becky stayed hidden until after the test ended, when she found the real Alice, now believing her to be her mother. As they left the house they were confronted by an a squad led by Jill, Rain, One, and Dyson, Becky mistakes the Dyson clone as her dad, despite Alice's protest to otherwise.

Alice led Becky to a train station where they encounter the Rain clone Becky met earlier. When Alice tells her to go hide with Rain, Becky tells Rain about how she met her 'evil sister' earlier on. Alice returns from helping Leon, Luther and Barry in the Red Square and the group make their way to the elevator through the subway system.

When they reach the elevator, the Red Queen disables the elevator, allowing the Umbrella soldiers to catch up with them. Rain was tasked to look after Becky while the rest tried to get the elevator working. Rain was killed by a surprise attack from a Licker. The licker captured Becky and Alice went after her.

For a short time, the Licker held Becky hostage in an cocoon before she was saved by Alice. While trying to make their way back to the elevator, they came across a room filled with countless clones of various people they encountered before. Becky came to a realization that Alice was not her real mother. In response, Alice tells Becky that "she is her real mother now" and the two escape the room after Alice detonates a pack of grenades that kill the persueing Licker.

Becky and the others eventually made their way to the surface, only for their escape to be blocked by one last confrontation with Jill and Rain. At the end of the film, Becky and the others are brought to Washington D.C. where Wesker explains that they're fighting to the last of the surviving human race against Umbrella and the undead army.

Behind the Scenes

 * In an interview with the producers and Paul W.S. Anderson, when the question of whether or not Becky was Alice's daughter, the answer given was that their relationship would be akin to that of Ripley and Newt from the film Aliens. Alice forms a close relationship with the girl, seeing her as a way to maintain her humanity.

Further notes

 * A casting call for the film requested either a boy or girl roughly of the age of six, with parents "willing to be in Toronto".
 * In the second theatrical trailer, a scene featuring a red heads-up-display identifies Becky as a clone.