Rosie gone for 2 hours

Rosie escaped from the balcony last Tuesday when the window was open and she jumped. I thought she was in the bedroom. We searched the whole building for 2 hours. The security guard was kind and helped me call her name at the car park. At 9pm she came back by herself, sitting on the 3rd floor corridor in front of our neighbour's door. Maybe she smelt her food from the kitchen. I was crying so much. Now the balcony has a net, and I check the door before I leave. Please do not leave your dog alone on the balcony even for 1 minute.