Updated August 28, 2022 at 9:06 a.m. EDT|Published August 28, 2022 at 4:33 a.m. EDT Elizaveta Dmytrieva. (Courtesy of Iryna Dmytrieva) Comment on this story Comment Four-year-old Elizaveta Dmytrieva grinned as she pushed her stroller along the street in Vinnytsia, Ukraine. It was nearly five months into the war, but the city where her family had fled from Kyiv seemed safe enough. Her mother took an Instagram video as “Liza,” who was born with Down syndrome, led the way in a moment of delighted independence. Barely an hour later, the little girl was dead, her mother severely injured. And the image of her black and pink stroller, flipped on its…