Put all you non-sale/non-coupon items first
(there should not be many of these just stuff you HAD to get)
Put all coupon only items second
Put all sale/coupon items last SORTED by store.
When she gets to your other store items be prepared to call the sales out to the cashier. Have your circulars w/you just in case.
This can save a lot of money. Say Walgreens has their non-hormone milk for sale 2/$4. If at Walmart you can get Oak Farms (normally $3.50+) for that price. You just saved $3. You do that w/10 or more items & you've saved a bunch.