"Blue Moon Promise" by Colleen Coble

Yes, I got very into the mood to read westerns while I was on vacation.  I suspected I would, since we were traveling through a chunk of the West, so I brought several along with me.  Including this one.
Lucy Marsh loses her job as a seamstress and then finds out she and her two younger siblings are being evicted.  Her parents are dead, and her stepmother is uninterested in caring for Lucy's brother and sister.  And strange men have been skulking around and making threatening remarks to Lucy and ...