Just wait until she's around 5 o 6 inches. Then give it a week let them interact with each other through the divider, then after a week remove the divider, be ready to put it back in if things get ugly. There will be lock jawing and it looks a lot like fighting but its mostly them just checking each other out. If things get ugly (as in your male really starting to injure your female) put the divider back in, wait until she heals, then remove it again. They may pair up or they may not, it takes patience but you should give it a go. Goodluck!!!