No doubt there are multiple Monica McLeans out there, so probably a blind alley, but…
there was an author of a few romance novels back in the late 90s-early 00's named Monica McLean. Only wrote 3 then 'disappeared' even though the books were popular.
>https://www.fictiondb.com/author/monica-mclean~8531.htm
The author also had a website (currently not active)
>http://www.monicamclean.com/
Only mentioning because CBF's friend MM was a PIO (PR person) @ FBI in SDNY and started her FBI career in L.A. (home of failed screenwriters). That said, could be nothing…