I didn't really watch this series much but I did watch the last two episode but I can understand why she did all these stuff. In episode 23 when khun loung was asking her why she did all these stuff. She did tell him that it was because of what he did and said to everyone. She was first and legal wife, then he announce to everyone that who ever have a kid first he would give them all his wealth and name. His second and third wife is a servant of the house too. How would you feel, if all of the sudden your husband make your servant number and you last. That can drive any woman crazy.