Significance of Vivian's Train Dream

As Vivian was trying to redeem herself with her children, she had a dream about her and Sunny trying to get everyone around them onto the train. At the end of the dream, Sunny was excited because they met their goal, everyone got on the train. It wasn't until she was in Bali visiting Sunny that she realized what the dream meant: the "everyone" was all the love in her heart she had for her children, and the "train" was herself. Before that moment, Vivian had difficulty knowing how to love anyone, let alone her children.