Ms Driver with Kids in the Car seems to be rather impatient. I am 95% certain I have come across this driver in the same locality exhibiting the same behaviour, except last time she missed timed her attempt at passing and had to pull back. That time she didn't catch me again till well after the roundabout (yep I was cursing along faster than her) and then she passed me only to have me catch her again at the traffic lights.
She really needs to leave home a little earlier, to learn to be chill out and to demonstrate far more calmer behaviour to her children.
All her anger on both occasions has not achieved anything.
I just hope one day she does not misjudge it and someone gets injured or worse. A second or two is not worth it.