Hey jben. I wouldn't split them up just yet. A lot of problems can come from this. How long has the colony been established? Have you ever noticed any fighting before? Is this her first litter?
When the have babies sometimes it's best just to leave them be for a few days after thy have them. You disturbing them could cause stress. I know that my mice when they have litters they have a "community pile". They just all have there babies in the same spot and all lay down on em at the same time. I've also heard of rats doing this aswell.