Clara's a metaphor for the series as a whole.
She's been through 3 incarnations (Classic, TV Movie, New)
She lived for 26 years, and then died.
She came back in the modern day.
She lived from '63 to '89.
She can't write 16- the amount of years between the end of the classic series and the start of the new.
She can't write 23- the amount of years between the end of the classic series and her first appearance.
So, in essence, when the question is asked... Clara is Doctor Who.
No way are these all coincidences.
Where are you getting these dates from? Closest I can find is Clara from The Snowmen, who's gravestone reads 23 November 1866 - 24 December 1892.