Rivkah joined the Prophet because, her husband, a Rus Nobleman, was a believer. When he died on the journey north, she stayed with the Prophet, pondering what her place was amongst the believers. When she saw the valley, she knew she had found her purpose. She dreamed what it could be. She laid those dreams out to be built; It is because, of Rivkah that the valley became not just beautiful, but livable.