Originally Posted by Wraith Rider
ABS isn't interested in if you first start to brake and then turn or first start to turn and then brake. It just releases the brakes if the wheel locks.
If the side slip results from braking and the side grip is enough to hold you upright without you braking, it - in some way - WILL:
However, when the wheel is already sliding, the grip is a bit lower than while turning, what means if you are using very much side grip and have very little grip left to brake, that small difference could be enough to let you slip further.
I would agree if your just going into the next turn in the road a bit hot, however that is not that the OP's wife was doing, she was making a 90° turn on to an entirely different surface
possible ABS might help in that situation? sure, likely? NO