The announcement follows increasing pressure on Ms Christensen after a string of poor performances by Norfolk's Children's Services.
An Ofsted report into the authority's safeguarding of children in February rated the service as inadequate across the board and branded it "inconsistent and patchy".
And ongoing poor performances at the county's schools led to the first ever local education authority inspection by the watchdog earlier this month to find out what had gone wrong.
More top news
A woman has been banned from keeping all animals for three years after admitting neglecting her cat and four kittens - two of whom died.
With the cold weather expected to last for at least the next five days, the Met Office has issued various snow and ice warnings.
Cold but dry and bright this afternoon followed by a risk of icy stretches tonight.