Turns out her hunch was correct. She did have something more valuable. The card she found was made in 1869 and featured the "Red Stocking B.B. Club of Cincinnati," the sport's first professional team. It's considered one of the first baseball cards ever produced and its actual value could be worth more than $100,000 when she puts it back on eBay (with a higher starting price, of course).
The 72-year-old was quite surprised. She has never even been to a baseball game! Link -Thanks, Geekazoid!