One of my grandparents are Maori (NZ equivalent), therefore I am considered Maori if I want to be.

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You're always on my mind, girl.

Now if you're asking if you're an American Indian that's different. You obviously aren't because you admit yourself that you're majority White.
It's very surprising that you know nothing about your grandmother though.

You said you did a DNA test but did you try testing your father's mtDNA? If his mother was an Amerind then it would certainly show up.
http://www.familytreedna.com/products.aspx
Family tree DNA is probably the most accurate DNA testing company besides 23andme and the mtDNA test is 100$.

You said you took a DNA test and it didn't show an that would give you quite an answer.
What were your results again?

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"One of the Germans... would frequently snatch a child from the
woman's arms and... tear the child in half... Such incidents...
occurred all the time." - A Year in Treblinka, Yankel Wiernik,
Treblinka's "most authoritative eyewitness"

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What were your results again?

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Was Amerindian included as a separate group or were they just thrown in with East Asians like some tests?

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You can check this out and maybe send some email to the ppl in the blackfoot website

http://www.native-languages.org/home.htm
http://www.native-languages.org/blackfoot_culture.htm

http://www.blackfoot.org/

I bet they get lots of emails like that but the more info you got the better and if you ask them nice and respectfully they'll probably can give you pointers at least.

I think maybe you can ask them if theres a way to find out more about your ancestry on that side for personal reasons but don't ask too much for proof because they might get a bit touchy about that because of legal issues etc...(plus they might not be able to do that anyway)

Good luck!

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"Everyone helpin' each other whenever they can we makin' it happen, from nothin' to somethin'
That's how we be survivin'" - BEP