Yes. It's the Ancient Greek form -- a third declension noun which ends in a consonant. The stem is καλλιτέχνιδ- and when the nominative ending -ς gets added the -δ drops off so you have καλλιτέχνις. But in the oblique cases you see the -δ-, e.g. genitive καλλιτέχνιδος, accusative καλλιτέχνιδα.
Modern Greek rearranged nearly all of those third declension nouns to match first declension nouns, based on the accusative, as in η καλλιτέχνιδα, της καλλιτέχνιδας, την καλλιτέχνιδα rather than η καλλιτέχνις, της καλλιτέχνιδος, την καλλιτέχνιδα.
Καλλιτέχνιδα is also not the most common word to use in Greece. A woman will probably refer to herself as καλλιτέχνις but we'd write it with ι because it forms genitive as καλλιτέχνιδος or καλλιτέχνιδας. How would someone refer to a female artist in Cyprus in genitive? Της καλλιτέχνη;