Because she is a female, she has been more readily accepted into the community tank.
Had she been a male, she would have faced territorial issues from the other two males in the tank, who are constantly vying for a particular female's attention.
You might recall that Emmie Lou was born at my house (the 8th clutch of Lindsay Buckingfish and Stevie Fishnick), below. She is considered a blond marble - a cross between a black marble and a platinum angel. Crosses between black marbles and golden angels are also considered blond marbles.