A suspected unlicensed driver who allegedly struck and killed a 6-year-old boy in Pacific Beach, then fled, pleaded not guilty Tuesday to charges that include gross vehicular manslaughter and hit-and-run causing death. Deputy District Attorney Cassidy McWilliams alleged Tuesday that Sanchez fled and did not stop or call 911. Along with the felony counts of manslaughter and hit-and-run, Sanchez is charged with an infraction for driving without a license. If she makes bail, she is prohibited from driving and will have to be monitored by GPS. “We’re heartened to see that the District Attorney’s Office has brought a charge of gross vehicular manslaughter against Ms. Sanchez,” the attorney said.