What difference does it make if she's 
Japanese???

Er, you implied that she was part of 
the "Japanese public".  You tell me.

If she buys the raw stuff, meaning non fan 
subbed, it's the same as if a Japanese person 
buys it.

It's not quite that simple, particularly if a 
comparable local version is available.

A person that buys a product is a 
consumer regardless of nationality. The companies 
producing the anime don't give a hoot where 
you're from if you give them money for the thing 
they're producing.

Tell that to Pioneer LDCA, ADV, Viz, Bandai 
Entertainment, Media Blasters, Synch-Point, and 
Central Park Media.