Years ago I was told by someone in kashrus that chocolate made in usa may not contain animal fat. (doesnt mean it is kosher).
but chocolate made in europe may indeed contain animal fat which may not be listed on label. dont know if this is still true but
at that time most european chocolate bars were real treif!
don’t know what that woman was buying, but she implied that as long as the ingredients are good the product is good.
this theory (despite rav ahem’s opinion) was never that dependable
and is certainly not today.