"Woman Who Walked the Earth" isn't a real Magic: The Gathering keyword or ability—it doesn't appear in any official rules text, card, or mechanic. It sounds like it might be a flavor name, a card title, or possibly something from another game or story entirely, but it's not part of MTG's keyword vocabulary.
If you encountered this on a card or in a discussion, double-check the exact wording. You might be thinking of an actual ability like Landwalk, Vigilance, or a specific creature's name. Real keywords have defined rules in the Comprehensive Rules; this phrase doesn't match any of them.
For accurate help, share the card name or the precise text you're seeing, and I can explain the genuine ability, its common rules traps, and how it plays in Commander.