How?
By offering to let her come into Aaron's house and wash it and dust it and ca'm it, "just as if you were our mother," an invitation she could not resist.

To you this may seem an easy way, but consider the penetration he showed in thinking of it.

It came to him one day when he saw her lift the smith's baby out of the gutter, and hug it with a passionate delight in babies.
"She's so awid to do it," he said basely to Elspeth, "that we needna let on how much we want it done." And he also mentioned her eagerness to Aaron as a reason why she should be allowed to do it for nothing.
For Aaron to hold out against her admittance would have been to defraud himself, for she transformed his house.

When she saw the brass lining of the jelly-pan discolored, and that the stockings hanging from the string beneath the mantelpiece had given way where the wearers were hardest on them; when she found dripping adhering to a cold frying-pan instead of in a "pig," and the pitcher leaking and the carrot-grater stopped--when these and similar discoveries were made by Grizel, was it a squeal of horror she gave that such things should be, or a cry of rapture because to her had fallen the task of setting them right?
"She just made a jump for the besom," was Tommy's graphic description of how it all began.
You should have seen Grizel on the hoddy-table knocking nails into the wall.

The hoddy-table is so called because it goes beneath the larger one at night, like a chicken under its mother, and Grizel, with the nails in her mouth, used them up so quickly that you would have sworn she swallowed half of them; yet she rocked her arms because she could not be at all four walls at once.