The lady is typically blind to reason because of her faith.
If you examine the ten commandments as recognised by Christians, it is perfectly clear that only the first four are specifically ‘religious'; the remaining six are purely ‘social'. That is, they must form the basis of any rational and moral society.
I personally think religion is utter bunkum, but I fully support the necessity for Commandments 5 - 10 inclusive if society is to hold together.
These ‘rules' clearly existed from the earliest times, when mankind first began to live in settled communities which could obviously not have existed without them.
That was long before any of the monotheistic religions - Judaism, Christianity or Islam - were even thought of and thus long before the Ten Commandments were written.
Buddhism and Confucianism - both from around the 5th/6th centuries BC - for example, both exist perfectly happily as ethical/moral systems without dependence on gods. Even the Egyptian Book of the Dead, from over 2,000 years BC, contains most of the social concepts in the Ten Commandments.
As always with people like Ms Widdecombe, they just float over any attempt to get them to provide rational reasons for religious belief.