Actually, looking at the pic again, the crying girl on the right looks like an afterthought, as though she's been photoshopped into the pic.
The original story I read was that the crying girl had been crying on & off all evening & kept saying that the other girl was pinching her. Her mother ignored her as there were no other girls in the house & just felt that she was bored & so played up in order to go home quicker.
However, the story also said that these women were getting ready to go out on the town - would a woman take her young daughter along?
The original pic also showed an armchair (darkish brown) to the right of the picture, this also showed a slightly spooky face - but it was the kind of face you see in objects (like the man in the moon).