I doubt that many people will be willing to pay much for a quilt posted on Craig's list. Not sure, but I think her best bet would be an auction on eBay. I just did a search on eBay and came up with one quilt that is up for auction:
http://www.ebay.com/itm/Vintage-VELV...item4adcf7699c
and one that is up for Buy It Now or Best Offer:
http://www.ebay.com/itm/Vintage-Hand...item2340582a52
If I were you, I would do another search on eBay and then go to "completed listings" to see how much this type of quilt has actually sold for.