Kitty Power - born in a convent (Lixnaw)

[myluck!]

This may be nothing to do with Kitty but there is a C P , 15yrs  in the Workhouse in Listowel in 1911.

This would fit with the marriage.

LINK #200 to census page
This CP is shown as a servant in the workhouse with tonsilitis
Born in Listowel, Co. Kerry

[myluck!]

I was getting confused with generation there   

This looks like the marriage of Thomas Spillane and Catherine (Kitty) Power.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1929/09073/5282509.pdf

It shows her father as John Power deceased which if the story is correct, is a fictional name.

If you contact the church they may have more information than the civil records
Most churches recorded the mother's name and sometimes a reference to where the person was baptised if not in that parish and you might get more information this way - these records are not yet online.

http://listowelparish.com/