English Translation
She is talkative.
Is the お necessary？
@ericaw
You cannot omit お, which is not inserted here as a polite prefix, but is converting a verb etc. into a noun (the person who XXX). Example phrases with the same pattern are:
あの人はお人好しだ。（おひとよしだ）= That person is too kind/generous or believes everything.
彼女はおてんばだ。= She is a tomboy.
あのおじさんはお節介焼きだ。（おせっかいやきだ）= That middle-aged guy sticks his nose in everything.
Those are negative characteristics, so you don’t need 尊敬語 (polite prefix). But お人好し、おてんば、and お節介焼き with お are “the person who has a nature of X”.
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