Yes, you should feed your girl a small meal ten minutes before her shot. Never give insulin on an empty stomach because she can become shocky. If she ever does, a drop of pancake syrup should bring her out of it. Because it is difficult t test a dogs blood sugar, you must be very alert for possible negative reactions and always be prepared.
Please let me know if you still have any questions. I am happy to help.
Sincerest best wishes,