The analyses of a text #3

The narrator recalls his adolescence.
He is beginning a new life as an apprentice in Doctors' Commons at London.
The narrator's Steerforth is to come over with his friends to dinner.
Mrs. Crupp is his landlady.

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When he was gone, I rang for Mrs. Crupp, and acquainted her with my desperate design. Mrs Crupp said, in the first place, of course it was well-known she couldn't be expected to wait, but she know a handy young man, who she thought could be prevailed upon to do it, and whose terms would be five shillings, and what I pleased. I said, certainly we would have him. Next, Mrs Crupp said it was clear she couldn't be in two places at once (which I felt to be reasonable), and that "a young gal" stationed in the pantry with a bedroom candle, there never to desist from washing plates, would be indispensable. I said, what would be the expense of this young female, and Mrs. Crupp said she supposed eighteen-pence would neither make me nor break me. I said I supposed not, and that was settled.
It was a remarkable instance of want of forethought on the part of the
[David Copperfield by Charles Dickens]
1. I'd like to know if "there never to deist from washing plates" modifies "gal."
2. And I'd like to know what "make" means here.
Thank you in advance for your help.