People who use hand held mobiles whilst driving need to know that they will be prosecuted.
Report her to the Police, and as suggested her husband.
In my view, anyone who is caught on the 'phone by the Police, should have their 'phone confiscated.
I would even go so far as saying that if they damaged their own vehicle whilst on the 'phone, they should not be paid anything by their insurance company.
They have no consideration for the safety of others. Roadside Cameras could be used to catch these morons, and whilst I don't agree with speeding, I catching these fools must become a priority for the Police. Build the technology into Speed Cameras!