You won't get a loaner car, you'll get a rental car. Collision shops don't usually give out Lexus loaner cars....her insurance company will pay for your rental car though since it's her fault. Most dealership collision centers will have a car rental place (i.e. enterprise) on site on very close by that they deal with.
As far as bodyshops go, the one at Lexus of Peoria is not a Lexus Certified Collision Center, so instead of driving 2 hours each way, do some searching online and find a reputable body shop near you. Make sure they have a lifetime warranty on repairs and of course check their reviews online. Also, be sure to ask for OEM parts to be used only, they shouldn't have a problem doing that at all.
If you prefer a Lexus Certified Collision Center, the only one in IL seems to be Woodfield Lexus in Schaumburg. But that's about a 3 hr drive for you...lol. I personally would make the drive to have my car repaired at a Lexus Certified Collision Center.