Mary Maria Hedican Hedigan

Born in County Clare, Ireland in 1847. Mother Mary McNamara, father Martin Hedican. We have been told that Mary/Maria went to Australia when she was 12 or 13 but have searched hundreds of shipping records with no success. Also told that her parents did not accompany her but this is only heresay.

Found a Martin Hedican had numerous marriages but unsure if the spelling is Hedican or Hedigan.
Any assistance will be greatly appreciated. I have more information if that would be helpful.

C