Susan Amalia did with this donation what she does with much of the antique linens gifted to the Welfare League in Santa Rosa’s Railroad Square, she took it home.At her Sebastopol home, Amalia sorts the linens, perhaps cleans them up and, in some cases, runs an iron over them before they are displayed for sale at the league’s Railroad Square thrift store. But a recent item took her breath away. It was a large quilt, patterned with a repeating red star-like design on an off-white backing material. It was in almost pristine condition. “It looked nice,” she said. “I opened…