Belle had her two suitcases positioned by the door in the hall as if ready to leave. She had her room to herself and went to bring both bags back to her bedroom. She began retrieving items from various places and placing them in the two suitcases when Candy and Michelle entered the bedroom through the door to the balcony. Since they came into the bedroom and plopped down on the bed Belle has not seemed interested in packing anything else. Is she trying to keep them from seeing what she carries away? That's the only thing that makes sense of this to me.
But thinking of it a little more, perhaps when she weighed the bags she realized she could carry more, so she is now trying to get those things she was prepared to leave.