The woman, Samantha Wallace of Van Bibber Lake, driving the Plymouth van suffered injuries from a deployed airbag after she struck the back of a stopped Blazer, driven by Jeffery Wehrman of Roachdale, who was stopped waiting to make a turn.
According to reports filed with the Indiana State Police Department's Putnamville Post, Wallace was driving down Waterworks Hill and did not see the signal of Jeffery Wehrman's vehicle, which was stopped and signaling to turn left to enter the fairgrounds.
By the time she saw the turn signal, Wallace told officers it was too late to stop in time to not hit Wehrman, ISP trooper Heath Kerns said.
Wallace was sent to PCH after she complained of back pain, Kerns said.
Members of the Putnam County Sheriff's Department worked with ISP to direct traffic coming in, out and past the fairgrounds.
The van was towed by Kenny's Wrecker Service a little after 5 p.m. Wednesday.