Police investigate a major crash at Route 22 and Quentin Road in Kildeer that left Joan Smagacz, 73, of Grayslake, (inset) critically injured and two other women seriously injured and caused a lengthy intersection closure on February 20. Smagacz died on June 26 in the hospital, over four months following the incident. | Photo: Nick Rusin A Grayslake grandmother is being laid to rest Thursday after she died months after suffering critical injurie…