It's not split personality or something....she want to get past david as she has been under depression and alcohol and needed a fresh start....so she changed her name from janet to kendra...that's all. Like few girls eat ice cream....few buy clothes lol she changed her identity to get past over her depression to forget David.Yes, I know that I was just surprised because that's the first time she's spoken as if they were different people.
Maybe this goes hand in hand that Janet is the boss and Kendra is just her subordinate alter ego.