She must be taught English and educated, and made possible in "Christian clothing," as Mrs.Armour put it.

Of the education they almost despaired--all save Richard; time, instruction, vanity, and a dressmaker might do much as to the other.
The evening of her arrival, Lali would not, with any urging, put on clothes of Marion's which had been sent in to her.

And the next morning it was still the same.
She came into the breakfast-room dressed still in buckskin and moccasins, and though the grease had been taken out of her hair it was still combed flat.

Mrs.Armour had tried to influence her through Mackenzie, but to no purpose.

She was placidly stubborn.
It had been unwisely told her by Mackenzie that they were Marion's clothes.