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Stock will probably work just fine for your daughter unless she uses the car for track days or auto-x. Generally overheating is just due to age and debris in the radiator and a/c condensor fins. You'll also want to make sure both fans turn on.
If you want to upgrade, my vote is for the DeWitt.
To cool down these c4 , you have to do more then just change the radiator, if you want to get in the 190 range, witch will extend the life under the hood by about 10 years, you have to go with the whole package, rad , waterpump,thermostate, fan sensor and fan upgrade
We live in the desert and it gets hot, I will consider an upgrade, I plan on changing the thermo to a 160, but what would be a good water pump to use? It makes sense to change the water pump also with the rad out.