A couple of my parents' neighbors found Izzy and put her in the garage tonight. Unfortunately, the back door was opened (in case she found the backyard and wanted to come in) and she ran back out. My dad saw her at the neighbor's house and got within 15 feet of her, but she's frantic and took off again-- in the direction of the house, but she never arrived there.
They're hoping that she's somewhere near the house, so when my folks called, they were sitting on the front step with food, her favorite squeaky toy, and Harry and Z, in hopes she'll come to her senses and come home.
If you're in the Cascade/Grand Rapids/Thornapple River Drive area, please continue to keep an eye out for her!