This woman and boy were actually Immortal Qi Jing and the little girl.
They had taken some risks gathering fruits outside Shu Mountain a while ago. The stolen fruits were quickly eaten up, and the little girl started making a fuss again. Immortal Qi Jing was at his wits' end.
He originally thought that these fruits only existed on Shu Mountain and might be some kind of exotic rarity, so he only intended to take a few fruits and be done. Later he saw Chu Liang selling them in gift boxes, guessing that there should be a decent yield.
Why not transplant some of them to the Sacred Mountain then, and feed the little girl with them every day? Anyhow, these things don't contain much spirituality; their demand for water and soil could not be high.
That's why he brought the little girl to Shu Mountain.
