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My mother's grandmother, what should I call her?

Grandmother.

Mandarin, period.

Written language, period.

Your respectful name, aunt.

Spoken English, Grandma.

Formal title, great-great-great-grandmother.

Symmetry, nephew great granddaughter/nephew great grandson male.

Grandmother.

Mandarin, period.

Written language, period.

Your respectful names, aunt and grandma.

Spoken English, Grandma.

Official title, from Gao-Gao-Queen Mother/Gao-Gao-Queen Mother's aunt.

Symmetrical, from great-granddaughter/from great-grandson male/niece great-grandson/niece great-grandson male.