Thank you for your speedy reply Hyacinth! After going back and looking at the photos of this bag, I noticed she has two different ID number tags.
One - K9P - 9060 is a photo of a tag all by itself, probably from a real COACH bag
The ID on the purse she is selling is G9P - 9060
To bad...
That's a common trick of less-than-trustworthy sellers. They'll post a photo of just the creed stamp and serial number (that's the bag you'll probably get) and also post photos of another bag in the same style that's in much better condition than the bag they're actually selling. Both bags may be genuine but the lovely clean almost-new bag that makes up most of the photos in the listing is NOT the bag you'll be getting.
Never depend only on the Feedback that Ebay makes available - use the Toolhaus.org site to get the whole selling history.