Elaine, this is the 1891 household you mention but it’s the wrong Catherine age 71:

KELLY Catherine 71 Rushen 4692 29 34

Four Roads, Port St Mary, Rushen

Ancestry’s transcription:

Name Age
Catherine Kelly 71
Catherine Kelly 45
Cordelia Kelly 13
William A Kelly 10
John T Kelly 8
Ernest J Kelly 1

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This is your Catherine in 1891:

KELLY Catherine 71 Malew 4690 131 58

Abbey House, Ballasalla, Malew

Catherine Kelly / head / single / 71 / living on own means / b IOM
Cathrine Kelly / niece / single / 25 / living on own means / b Liverpool

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Jean C