Feeding my emperor scorpion?

I just bought my daughter her first emperor scorpion. The guy at the pet store said she was pregnant. We've only had her for three days, but I'm worried. I haven't seen her actively kill any crickets. We put them in before going to bed and they are still there in the morning. What do I do? Am I worrying needlessly? Do I need to do anything different because she's pregnant? Any help is greatly appreciated.