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Saw your post before it was deleted.
It doesn't sound like anything serious. What I believe is probably happening is that the pressure has dropped because the temperature has dropped. If the tires "look right" (all 4 look the same, no obvious bulging or sagging), it's OK to drive at city speeds for short periods. These new tire pressure sensors are known for being sensitive and giving false alarms.
I would suggest having DD buy a tire pressure gauge at Wal-Mart. It's cheap and good to keep in the car anyway. Preferably one with a round gauge and a short hose to press into the valve stem, but a pop-out stick type is OK too. Depending on the result, she can stop by any self serve station with an air pump. Usually 50 cents or a dollar for air.
The recommended pressure should be printed on the tire itself, and can also be found in the owner's manual and often on a label inside the driver's door. Generally should be between 32 and 36 psi, but anything above 28 is safe with the limitations as mentioned above.
If this is more than she wants to tackle, and she doesn't want to go to the place mentioned above, I'm going to Oxford this afternoon. PM me and I will help her or get my DD's boyfriend to help her.
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