So we had a pair of female gerbils up until recently when one passed away. The other is now lonely and We are wondering if she will be okay. We have another pair of gerbils who are her sisters which we separated from the other pair about a year or two ago because they started fighting. So we were wondering, would it be possible to reintroduce them, or maybe put the two cages next to each other so the single gerbil has company? I’ve heard that this might cause the pair to start fighting, however. What do you suggest if neither of these options are viable?