Cahalane/Coholane from Shreelane West Cork

Looking for

(a) Helena Cahalane b 1888 in Cloonkeen, went to Boston 1910, may have returned to Cork 1913 and otherwise missing. Her parents were John and Helena.

(b) Mary Cahalane b 1856, married Patrick Donoghue/O'Donoghue in 1877, 3 children know Margaret, Michael & John born between 1878 and 1887 no further contact.

Any help appreciated. Laim Keilthy