You don't want them to grow really fast. I think it effects their pattern. Best to feed them well and let them grow as nature intended. She is Batgirl's sister, right? I can't keep track anymore. LOL
Were they out of the Jan 12, 2010 litter? I can't remember exactly when you got her. Sandy is Batgirl's mom. I know your female is one of Sandy's, but couldn't remember if she was a full sister to Batgirl or possibly just 1/2.