Separate her from the other rabbit. A doe can sometimes suffer from stress and either abort her babies or even eat them when they are born. Don't disturb her too much and when she has the kits, give her lots of nourishing food, but leave her in peace. Don't be tempted to peek at the babies for at least a week, maybe longer. If you let her get on with it, you have more chance of a healthy brood. Good luck. K.