Your 17 yr old Cath Kelly, niece b Liverpool, with her 2 Liverpool born sisters in Malew in 1881 census:

Ancestry’s transcription (Christian H should be Christian F)

Name Age
C. Kelly 61
Christian H. Kelly 20
Margaret A. Kelly 18
Catherine P. Kelly 17

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From Liverpool baptisms:
Name: Catharine Kelly
Baptism Date: 10 Apr 1864
Parish: Toxteth Park, Holy Trinity
Father's name: George Kelly
Mother's name: Annie Kelly
Reference Number: 283 TRI/2/1

39 Bedford St / father’s occupation: seaman

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older sister:

Liverpool, England, Baptisms, 1813-1906
about Christian Faith Kelly
Name: Christian Faith Kelly
Birth Date: 18 Jan 1861
Baptism Date: 19 Feb 1861
Parish: Liverpool, St Peter
Father's name: George Kelly
Mother's name: Ann Kelly
Reference Number: 283 PET/2/50

Toxteth Park / father’s occupation: mariner

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Jean C