Lauren Spierer’s family still misses her, still holds out hope that she’ll be found. But on Sunday, what would have been the Indiana University student’s 30th birthday, a simple tweet from her mother told the tale: Lauren would have been 30 today. If only…#FindLauren @NewsOnLaurenS pic.twitter.com/aCgRa5Fizj — Charlene Spierer (@CharleneSpierer) January 17, 2021 Spierer, then …