Here we have Coriander Widetrack, one of the most recent re-releases from Mattel's 1:55 scale Disney·Pixar Cars collection! She has just started hitting store shelves (I found her at Target just a couple days back) and is part of the 2016 "LA Speedway" sub-series (#1/11). The original release for this character was clear back in 2009 in the "Final Lap Collection", so it's nice to finally see this one resurface.
As shown in the screenshot above, Coriander is briefly seen near the end of the film in the crowed right before the big Piston Cup finale race begins. She is between M.A. Brake Drumm (who is also being released this year) and the previously released Brake Boyd (seen HERE) and appears to be their "daughter"— red and blue do make purple after all ;). Why they all have different last names beats me, but it's strongly suggested they are a family.
Just like in the film, Coriander here is holding a jet toy (which resembles Stu Bop the jet from the same scene). Overall this is another well made, detailed diecast from Mattel that you (my fellow Cars collectors) will have to keep a look out for.
Best of luck on the hunt!