Gorilla Glue Auto - Stunted or Normal?

She is quite small but you're going to be entering the flowering stretch soon where she will double in size 👍🌱

What I see is a nutrient deficiency. Are you watering with tap water or purified bottled water? Because if it's the latter, you probably don't have enough calcium/magnesium in your concentrate. Another possibility is that since they are autoflowering, they only have 3 to 4 weeks of vegetation, and there wasn't enough concentrate to provide the nitrogen needed for the stretch that should have happened since it's really small. Weigh the pot before watering because it might have too much water due to the shape of its leaves.