To find out how much flour Gabrielle has left after using 7 ounces, you can subtract the amount she used from the total amount she bought.
Total amount of flour = 9.4 ounces
Amount used = 7 ounces
Amount left = Total amount - Amount used
Amount left = 9.4 ounces - 7 ounces = 2.4 ounces
Gabrielle has 2.4 ounces of flour left.