Kate Losse, May Holland, Kate Losse, May Holland... hmm.. is not particularly close.

Also, one is fiction, one isn't. Last time I checked it was completely normal to write fiction based on amalgamations of real situations. And given that it is satire, this would also seem to be a prerequisite in this case.

Now while there is certainly sexism in the world, in the world of books we are long past the days where female authors had to change their names to be successful. If her book did not do well, perhaps she should look to the form and content rather than her gender. If you look at the bestseller lists, women are solidly represented and are commonly the majority. The main disparity is not gender, but fiction vs non-fiction. Fiction sells much better.