Kid knows chess (basic, but can think two ply ahead locally). Likes it.

Doesn't know draughts.

What variant to start with? Any ideas?

@damki_man
It depends on your local traditions.
Yet if you live in a region where draughts are played under International rules (10x10 board), even in this case 8x8 board would suit much better.
Just for comparison purposes, try to look into picture www.bec-et-croc.com/jeux-traditionnels-en-bois/11886-maxi-jeu-de-dames-tissu-85-x-85-cm.html : from pedagogical perspective, it is better to play with large size pieces before age 7, but in that picture the total size of board is excessive. (I say it as kindergarten administrative director, and in my kindergarten all 4+ kids are playing draughts actively.)
However, there are also 2 factors to be considered: simplicity and availability of training books.
Herebelow I had arranged these variants from more friendly to beginners to more complicated. Yet "more complicated" doesn't mean that it requires higher IQ or very particular mindset. ¨"More complicated" means nothing more than "containing more complicated rules".
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Backwards jumping variants: Pool > Brazilian > Russian
Non-backwards jumping variants with slow king: English > Italian
Non-backwards jumping variants with "flying" king: Tanzanian > Thai > South German > Czech > Spanish
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@kalnap Our local traditions are English draughts, if you're lucky, but no one really plays now. Or American Pool, if you're really lucky.

Basically she is not going to have any peers to play with. There are no draughts in the schools. I or maybe her mom will be her playing partners.

Although my wife is from an area where they play Russian draughts. Maybe we should teach her English and Russian rules.

And I suppose Frisian has backwards jumping, flying kings, and orthogonal capture.

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