Sharpshooter in Petticoats by Mary Connealy
From Goodreads.com:
Aim for hours of reading pleasure with award-winning author Mary Connealy’s last book in the Sophie’s Daughters series. Mandy Keating, a wealthy sharpshooting widow, is content living in her mountain home and raising her young-uns alone. But how long can she protect herself when thieving outlaws have her surrounded? Rancher Tom Linscott can’t bear to see a defenseless woman in danger. Yet his rescue efforts end up bringing trouble right to her door. Now that they’re both trapped on Mandy’s Mountain, can they learn to live together—or will they die alone?
