C.O.P. Out is the sixth in the Elena Jarvis series by Nancy (Fairbanks) Herndon. I remember reading this series, set in a thinly disguised El Paso, IMS, back in DTB days, and enjoying most of them.
Out has dropped to $1.99 at Kindle and Kobo US (coupon/VIPable).
Kindle US:
https://www.amazon.com/C-P-Out-Nancy...dp/B00J90C63G/
Kobo US:
https://www.kobo.com/us/en/ebook/c-o-p-out-1