Wait wait ... if you go to
the Amazon UK listing for
A Moment on the Lips there is a quote from Liz herself saying it's a wonderful book!
I haven't read it but judging from the page, while it does have some basic similarities to Liz's novel (focuses on weight loss and a character's husband has left her) these are all chick-lit staples. It is also about a group of friends who meet at a slimming club while Liz's novel is self-absorbed tripe about one woman losing a lot of weight through liposuction - which you can't do, you'd need bariatric surgery, but that might require Liz to actually do some research! And I bet
A Moment on the Lips doesn't contain casual racism or comments about disabled people either