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The CEL might come on...if she drove the car on a regular basis. Thats what I would be doing despite the high idle. I would drive that puppy and see what happens when it is fully hot and see if I could encourage the computer to throw a code.

With the hood open inspect the cabin air intake at the base of the windshield for debris like leaves etc. If nothing is blocking the cabin air intake follow the next step. With your AC set to AUTO and auto pass through,....turn off your car, open the glove box, remove the plastic parcel shelf (lift and pull out from the back and side). Slide up the black plastic panel at the back of the glove box which gives access to the cabin airbox and filter assembly. If the "white door" is down and you cannot see the filter assembly,... DO NOT LIFT the DOOR!!!! You can damage the mechanism!! Turn back on the power and operate the AC controls until the door raises! Once you have clear access lift and remove the filter and inspect for leaves or sucked in debris. Replace filter if scheduled,....usually once per year. Run the AC to see if you can hear the noise before putting everything back.