lol, that's an interesting assessment. I don't disagree with the concept of comparing rugs, but I do think that the rug compared, although very similar, can be somewhat misleading.
I want to mention something because I know going by images is helpful
sometimes. However, I have seen this design of Afghan rug go for upwards of $60 per foot for very high quality & luster wool and an excellent example with subtle detail.
Now on eBay, completely different variety of this Afghan type. I've seen some of these styles sell for as little as a few dollars a foot. I wouldn't throw numbers out to her unless seeing the rug in person. Condition is everything. It may be she's asking a fair price, although I do think this is of the ebay type genre.