Hi Elsa
I think mothers intuition starts with the way the children acts.
Mothers will have the most contact with children, they give birth, they feed them and they see how they raise up.
They know their children, and when a child shows behaviour that wasn't before, the mother will of course notice it.
Than they will have questions, because mothers are also very curiouse.
The child than thinks he/she can't keep a secret for mother.
But mother doesn't know excactly what's going on, so they use like Chastance said a shotgun to hope they can catch a fly.
When you shoot again and again there is a possibility you hit the fly.
No, not intuition, just a good look at your children and fishing till something is catched.
hugs
Annette