You can get sets of mini beanie babies / beanie boos on Amazon that are old in-package mcdonald's toys.
Dollar section of Target is an every changing source of treats.
Get a set of cheap animals, bracklets, etc. from a toy section and give her one at a time. Those "Nature Tube/TOOB" collections are great.
Stickers. These are seriously currency at our house.
Piggy bank and give her coins. Very popular with my 4 year old boy.