Her novel is a tale of class, privilege and female rage.
The book was due on sale on Tuesday.
The book has been part of a major bidding war.
Book publisher Penguin is rumoured to have won the rights to her biography.
"If you don't like what the author wrote, then don't read their books."
Following Roald Dahl classics being altered, 007 is next in line.
Cowley's love for life - and writing - shows no signs of slowing down.
The beloved children's book has been criticised for its lack of diversity.
A recent study suggested the story perpetrated "outdated stereotypes".
