first off, have her get it scanned like you told her to.

are the fans working when the a/c is on?

and do the fans come on when the engine gets warm? with out the a/c being on?

sounds like it could be a bad temp sender. it located under the t stat in the manifold. the wires also could be fubared as the exhaust is right there to cook the wires.

the scan will tell you more tho.