Well Cora decided that once her boys had left that her mothering days were done and she'd had enough of putting others first. Things descended into aggression fairly quickly and Cora wouldn't let Louise have any of the food or water so even though it's not ideal for a baby hamster to be on her own at four weeks old, I decided that Louise would be safer on her own.
Thankfully little Louise is unhurt and I'm doing what I can to help her settle into single life.
Here's a photo of the little lady in her own cage:
baby Louise by
Metallica Hamstery, on Flickr