‘That’s North country.’ She laughed again. ‘Setting aside my good looks and yours, I’ve four thousand a year of my own, and the rents should make it six. That’s a match some old cats would lap tea all night to fettle up.’
This is from "In the Same Boat " by Rudyard Kipling.
I don't understand the meaning below
That’s a match some old cats would lap tea all night to fettle up.
According to the text note of Kipiling society, fettle up normally is an engineering term meaning to finish or smooth metal, but here meaning to bring off or accomplish. https://www.kiplingsociety.co.uk/readers-guide/rg_sameboat_notes.htm