I'm a type 1 diabetic with an insulin pump and have had few issues with the TSA. When I go through the TSA "security" checkpoints, I immediately notify the screener that I have an insulin pump and related supplies and that I can not remove my pump. If told to go through the weenie-vision scanners, I refuse due to medical reasons. Generally this is not a problem, however in the rare instance where the TSA representative pushes back, I demand that they call a supervisor.
For all the years I have flown, I only had an issue with a TSA representative once, and that was at the Fort Lauderdale airport. I stuck to the script above, and demanded to see a supervisor. Needless to say, the agent was ordered to go off duty.
With that said, Savannah should have RTFM better. While I do not know what brand of insulin pump she uses, my pump manufacturer has a card on the first page of the owners manual which is mean to be cut out and carried. On it, it states the following
"Medtronic has conducted official testing on the effects of the full body scanners at airports with Medtronic medical devices. Some of the new scanners may include x-ray. To avoid removing your devices, you may request an alternative screening process. If you choose to go through a full body scanner, you must remove your insulin pump and CGM (sensor and transmitter). Do not send your devices through the x-ray machine as an alternative."
A pdf of that card may be found at http://www.medtronicdiabetes.net/sfc/servlet.shepherd/version/download/068C0000000IY43
The manufacture even goes as far as having ample documentation on their website. See the following:
Medtronic Airport "security" guidelines: http://www.medtronicdiabetes.net/lifestyle/travel/tipsonflyingandairportsecurityguidelines
Medtronic Equipment Interference chart: http://www.medtronicdiabetes.net/lifestyle/equipmentinterference