Hello again sylviasmaxie,
I believe the book you are looking for is called "All Is Vanity" by
From an Editorial review by Amazon.com:
"Lifelong best friends Margaret and Letty are in their mid-30s.
Margaret has just quit her teaching job to write a novel in Manhattan;
Letty, her husband, and her four children are enjoying their first
taste of worldly success in Los Angeles. Margaret soon discovers that
writing is not as easy as it looks, and Letty finds herself
financially over her head in the one-upmanship of L.A. living. Reading
Letty's hilarious e-mails, Margaret realizes that a great story is
unfolding right in front of her, and she begins a new novel based on
her friend's travails. Hungry for more drama in her novel, she pushes
Letty deeper and deeper into debt..."
This book is available for purchase at Amazon:
book "quit her teaching job" "write a novel"
I hope this is helpful. If you have any questions regarding my answer,
or believe this is not the book you remember, please don?t hesitate to
ask for further assistance before rating.