On the A4232, driving in the left hand lane whilst she's driving in the right.
She's driving quite slow in the right hand lane, so I begin passing her, and she cuts across into my lane without checking her mirrors, and indicating as she swerves across.
Almost sent me into the side reservation. Tried beeping getting her attention on the slip road to calmly let her know what happened, and she looks utterly focused on the road in front of her (kinda tunnel vision) - with absolutely zero awareness of the traffic around her, especially when changing lanes.
So very close to crashing because of her inability to drive, and lack of awareness on the road.
Excellent driver. Should be in F1 but is actually too cool.