Tell me why this is a foul in 9 ball, please.

[middleofnowhere]

She must have been aware of fouling there was no body language indicating otherwise.

Yeah she walked away so quickly it's as if she called it on herself

 

[Positively Ralf]

Right as the camera switches you can see the nine ball moving.

 

[garczar]

Yeah she walked away so quickly it's as if she called it on herself

the ref was on top of it. he called it as soon as it happened. he was staring right at it knowing that the foul was likely.