That's a handy function that smaller counties can get away with.

Okay, so you've searched the cases for her name. You didn't find anything?

I assume she was domiciled in Coles County at the time of her death, and that the real property was located in Coles County?

It looks like Illinois upped the small estate limit recently. You'd want to know how the real property was disposed of. Did it transfer on death? That's possible.

It appears that you can search by address, here:

https://colesil.devnetwedge.com/

I found some additional cursory information on small estates in Illinois:

https://www.illinoislegalaid.org/legal-information/using-small-estate-affidavit