(They conveniently forget to mention that the tree ring chronology was arranged by C14 dating.
This skews the 'real' answer to a much younger age.
Despite this she continually uses the c14 dates to create 'absolute' chronologies.
She says this is ok so long as you take into account the correction factors from dendrochronology.
After all, this what the archeologist guessed in their published books.
Some believe trees are known to be as old as 9,000 years. A lot of people doubt this claim for various good reasons I wont go into here.