I Am Not Hungry But I Still Want Cake! // Intuitive Eating

Last week I had a conversation with a woman who is trying to practice intuitive eating and listening to her body. To eat when hungry, stop when full in order to restore a healthy relationship with food and eating. But she went to a party and after a meal she felt full but then came the round of dessert and cake was offered. She wasn’t hungry but felt like eating the cake, after all, everybody else did and seemed to have no problem with it. So should she go by fullness and only eat the cake when she gets hungry again or should she eat the cake just because she felt like it even when she wasn’t particularly hungry? What is a normal or intuitive thing to do?