"She was poor and she was honest" and "that's all he wrote"

M. Quinion, a Brit, writes about 'that's all she wrote' as per

When it starts to get really dark - when the sky goes
from blue to purple - I'm flipping back. That's it;
that's all she wrote. I'm not walking through these woods
after dark.
[The Talisman, by Stephen King, 1984.]

Skipper Tom meowing and hopping around like he had the
itch. Then dumped a load of cat crap all over a lobster
trap. Jack threw it overboard to rinse it, and that's all
she wrote buddy, he was jerked into the water.
[The Shipping News, by E Annie Proulx, 1993.]


"When I first came across it (it's not well known in the UK), I was
puzzled by it. On the one hand it was obvious enough what it meant
but why should anybody drag in a reference to an anonymous woman
writer?"

Answers on an envelope, directed to Grice, "Vacuous Names" and pronouns. Or not.