Dori

Dori was an Umbrella-engineered clone created as part of it Umbrella Prime viral experimentation.

Biography
Engineered to appear fifteen years of age, she was freed from certain death by Judy-Tech, a member of staff who was longing for a daughter. After Ada Wong's execution of the control staff, it became clear to Judy that the facility was soon to be destroyed, and Dori went with her to the submarine pens to escape. There, Dori was confronted by Tom Pepper in the kitchens; Judy was able to diffuse the tensions and the three decided to steal the submarine and escape to the outside world, which Dori had yet to see.

Leaving the Russian coast, they arrived at Catalina Island, where the submarine was scuttled and the three joined a group of survivors there.

Further notes
As the official noveliation of Resident Evil: Retribution, it is presumed the new additions to the storyline are part of the W.S. Anderson movie canon.