The drastic dragon of Draco, Texas

Determined to become an author of western penny dreadful novels like her idol, Ned Buntline, a young San Francisco newspaper editor christens herself Valentine Lovelace (after a floozie acquaintance of her father’s) and heads east for the Wild West.
She finds it in spades in the Texas Big Bend when she is kidnapped from a mule train by Comanches and ends up the guest of a ruthless comanchero, a sort of wild west warlord, after the Comanches are distracted by a. . .dragon?
Fort Draco, as the comanchero fort is known, is as full of intrigue and nighttime carryings-on as a modern day romantic novel, but Frank Drake, the owner, is no hero. If Valentine wants to save herself and the less-guilty if not entirely innocent folks who live there, she must defeat heat stroke, gunslingers, a couple of fake rainmakers and their camel, hostile Indians, the voice haunting her dreams (not in a good way) and a dragon who not only is gobbling all the livestock and transportation in the area but is guarding the only water hole in fifty miles of drought-ridden desert. And she must do it all while taking good notes, of course.
This is a western but not as we know it and a fantasy set where we’re not used to it.