MARION — Jenny Perez waits for the day she “falls apart,” the day she remembers details of the horrific crash that killed her 13- and 16-year-old daughters nearly two years ago.“It’s still hard to believe they are gone,” Perez said, starting to tear up as she sat in her Marion home last week, talking about the deaths of Selena Apodaca, 16, and Bella Severson, 13, in the Nov.