>>53782130She DID steal a 15 year old from his own time, bring him to the past, where he became akin to Demi-God in the eyes of the people there due to his ability to handle pokémon, before vowing to join him if he proved himself worthy to Her.
Or she just may have had a thing for Lucas himself, She did look down over his younger self taking up the mantle of Her Champion unasked. That kind of thing tends to leave an impression on a woman.