Luna was found in a Hydra base at the age of 18 a year after Wanda and Pietro Maximoff were freed.
Wanda found Luna on a mission to find Bucky after the physiologist put Bucky into winter soldier mode.
Alena Maximoff was born and bred to be a killer. Alexander Pierce made sure of that. From the age of five Alena was no longer a person, she was a weapon. Still, try as he may, Pierce could not rid the girl of her memories. There was still a damaged mind inside her skull. The mind of a soldier.
(Chapter lengths vary)
I do not own any of the marvel characters, or it's universe.