Narcissism?
My mother is a narcissist and I've seen her do/say some horrid things
But when confronted,she will lie her way out of it as in her head,she genuinely believes she's innocent
A 'minor' example is she was in a cafe and was caught by the staff loading sugar,sait,pepper and teaspoons into her bag
The staff confronted her and told her to put it back
She did but by the time she'd got home,she'd convinced herself she hadn't done it and slandered the cafe to high heaven (thank god she can't 'do' the Internet or she would have really gone to town on TripAdvisor)
As it was,loads of people believed her and stopped going to the cafe in support of her
Or the time a book 'accidentally' fell into her bag in a charity shop
No way did she put it there and walk out-she wouldn't dream of stealing-it definitely fell off the shelf and landed in her handbag and she didn't notice
It's Oddly fascinating to watch