I dunno ...from what I could tell, it seems to meet checkpoints I know about, such as brushed brass hardware, rounded handles where they attach to the hardware, silver zipper. A closeup of the padlock to see the size of the name font, and a few inside shots of the fabric and serial number would be helpful.
However, a comparison of this one from net-a-porter shows it's missing the stringy thing hanging down from the handle, at least I don't see it. The proportions of the leather pieces in the front look fine, but I'm not sure about the proportion of the stitched "loop" on the side. I personally like to see larger, higher-res pics for high-dollar purchases like this, not the crappy eBay ipix. Maybe ask her if she can un-stuff it, too, so you can see the "slouch."
Chloé Paddington leather bag - NET-A-PORTER.COM