How did Dolly tell Silas to punish Eppie?

From the text:

"you might shut her up once i' the coal-hole. That was what I did wi' Aaron; for I was that silly wi' the youngest lad, as I could never bear to smack him. Not as I could find i' my heart to let him stay i' the coal-hole more nor a minute, but it was enough to colly him all over, so as he must be new washed and dressed, and it was as good as a rod to him—that was. But I put it upo' your conscience, Master Marner, as there's one of 'em you must choose—ayther smacking or the coal-hole—else she'll get so masterful, there'll be no holding her."