A BG rise with sugar is definitely possible in 12 minutes. A drop of the same size with insulin is unlikely unless magnified by exercise.
Remember that glucose tabs are designed to be very rapidly absorbed (ie very high GI), and orange juice is also high GI. My daughter is 8, and 1 unit of insulin drops her BGL 16 mmol (288 mg/dL), this is equivalent (for her) to 15g carbs. So 9 g without insulin will raise her BG 9.6 mmol (172 mg/dL). It all depends on your 4 year old's ratios.
Alcohol - I agree, do not use. Soap and water is the best, and usually this is unnecessary unless they have been playing in the dirt or swimming in the sea.