Bound for Temptation by Tess LeSue

Having survived the Oregon Trail, Emma Palmer is ready for a fresh start, even if it costs her all the gold in California.
Emma Palmer has had many jobs and has gone by even more names, but most recently she is known as Seline, madam of her own establishment. Her place is clean, her booze is cheap and her bedrooms are fancy. But when a would-be patron won’t take no for an answer, she is forced to don a new disguise and flee for her life. While the schemes she cooks up might seem outrageous to an outsider, they haven’t failed her yet.

Tom Slater is a taciturn cattleman at the tail end of a long, hard season on the trail. He’s looking forward to a quiet winter at his old family homestead in Mexico. What he doesn’t plan on is escorting a group of women on the run to safety south of the border. Tom doesn’t need to be a trailsman to know that the woman with the sly, green eyes—the one he can’t keep out of his thoughts—will only lead to trouble.