I think this isn't the first time Kanata visited Konata and Soujiro,just like what she had mention "It's been a while since i returned here"...her first visit was when Konata was still a small kid,probably a 1-2 years old kid as shown in the image below?
Owh for the first time i saw Konata blushing herself,when she try to open the bag..damn moe..