1: Mary Prince is saying that they do not feel happy in the slightest because they are treated so horribly.
2: Prince says, "How can they be happy with a halter around their neck and a whip upon their back, and are discraced."
3: The English, "Forget God and shame." People may change into this because they are not ashamed of their actions.
4: The fact that she has escaped slavery makes it more effective in my opinion because it shows that she wanted to be free. That being free is the only way she could be happy.
