Unchanging Love — Linda Cushman

Susan Winford is a planner -- whose ideas always seem to go awry. Like when she finds two boys tossing the mill owner's cats into the river and tries to stop them. Her determination to reform the boys leads to a series of misfortunes for everyone, especially the handsome miller. Will she win his love or drive him insane?
Levi Kelly makes a good living from his mill on Cottonwood River. Or did until Susan got involved with two mischievous boys. Trouble follows her right into his business, and into his heart. Her innocent attempts to make things better are endearing and vexing. She plays havoc with his heart while unwittingly contributing to the destruction of his mill.