People change their minds. She told people that inquired for 10+ years that she did not have a desire to even interview for jobs at any level.
That said, I can see how the pragmatic Kara Lawson would consider herself under-qualified to take over as HEAD COACH of the program her beloved mentor built. But in her heart of hearts, I suspect she also recognizes that she has a gift — one that blesses her with a helluva lot bigger mental capacity for understanding and effectively communicating the intricacies of the game at its highest levels than most TOP head coaches today have, and she has now, for whatever reason, decided that she is willing to jump in head first to go be the BEST damn assistant coach in the strongest basketball league on the planet. And after she’s proved her mettle there? Watch out! She’ll have the pick of the job litter someday.