I also don't think she's ever been that calculating. Kahvi was more of a 'rolls with the punches- then punches you back' type than a scheming manipulative type. Urdah was right- there was no way she could have hid that kid forever- so for her to have planned to do that makes no sense. I think she reacted to his behavior during her pregnancy and made that choice then. I think that is in keeping with her character. The other is in keeping with Winnowil's character.