If she's still hungry, then feeding her in a different tank is not going to solve that. There are literally hundreds of posts on this site debunking the tank aggression myth, so I won't try to divert this thread the same way. It simply sounds like she isn't getting as much to eat as she needs/wants. You absolutely need to get a scale to track her weight, and you can check the food size with it as well. My guess is her prey isn't big enough, so she's still hungry. You can get a cheap digital scale in the kitchen section at Walmart.