One of the things I did was pull my cage out far enough I could reach around it. When one stayed back, I'd give the other a treat that took longer to eat (dried fruit), then reach nearer (not all the way to) with something sweet/stronger smell like yoggies. Only put your hand as close on the outside as your girl will let you, then let Nova strech & come to you. You may have to drop it on whatever she's sitting on before she'll investigate. It will take several tries, but it got my Morgana & Merlin out of thier shell.