I know of one that was pulling down $48K, but that was the rate 7 years ago. I wouldn't expect a newbie to the market (even an experienced newbie) to make more than $30K. There's just too much competition and stations don't want to pay a dime for anything. Most of them "lease" their traffic people from a service (MetroSource, NAVTEQ, etc) and often it's an exchange for spots. Trust me, the traffic services don't pay much, either.
Now, based on the current local traffic gal offerings, does your friend meet the requirements? In order: Large breasts, small frame that's able to accommodate large breasts, ability to buy your own clothes and have them specially tailored to accentuate your breasts, open to the idea of breast implants (at your own expense,) opposed to the idea of pregnancy (unless there's an opportunity for your breasts to grow larger while carrying a baby,) desire to spend as much time as possible with the camera crew to make sure that your breasts are being shot at the best angle, same for the lighting crew so that specific gels (lighting filters) are installed that will properly "color" your breasts, and also posing in various positions to make sure the breasts are well lit, and, of course, the mandatory signing of a contract that states if you gain weight, or otherwise harm your breasts or make them undesirable, you can be terminated with no notice or severance, and be chained to a non-compete for the next 3 years (1.5 years for each breast.)
Oh, almost forgot...it helps to know the area freeways and streets just a little.