For two years Nancy Mattern has been unable to decorate for Christmas. Illness has made it impossible for the 77-year-old to display 40 years worth of decorations, but this year she got a surprise from a group of local high school students. “It’s what Christmas is about, it’s about giving,” Nancy said. “And to be able to have my Christmas decorations up is something I thought was over and done with, but these kids, with their big hearts, are making it happen.” Mattern, who is in hospice care in Tucson, Arizona, loves decorating for Christmas, but ever since she got COVID, she hasn’t…