Yeah Your Right!
Since she returned the 2 pounds of unopened caramels to the shop (which cost $14) that she recieved in store credit.
She currently has $14 in store credit.
She buys 3 pounds of truffles, which costs her $48, since 16 times 3 is 48.
Then she can use her store credit ($14) and take it off of the $48.
48
- 14
$34
That would be how much she owes to the store, since she was charged $48 but used $14 store credit to get the price down to $34, which she currently owes.
Hope this helps,
-Garrett