If it gets too cramped she will move the babies out. Give her plenty tissue bedding to make another nest in. If they are only 3 days I'd try and wait a bit longer before you take her out. Some mums do beg a lot and we would let them out just for a quick cuddle at about a week old. Just feed and water then put the light out so she isn't distracted from her babies. Hope they do well. They will soon be coming out to meet you
