Synonyms for Gabby:

adj.

sociable (adjective)
vivacious, amiable, neighborly, genial, gracious, affable, talkative, hearty, easygoing, courteous, hospitable, sociable, convivial, companionable, friendly, amicable, folksy, chatty, cordial, garrulous, gregarious, congenial.
talkative (adjective)
garrulous, chatty, conversational, voluble, loquacious, talky.

n.

words, conversational, longwinded, yappy. gabby (noun)
garrulous, chatty, voluble, talky, loquacious, talkative.

Other synonyms:

longwinded. conversational, yappy. Other relevant words:
talky, voluble, conversational, yappy, loquacious, longwinded, words.