Beware typical-mind fallacy. This is a common source of friction even within couples. People don't all experience attraction the same way, for the same reasons, with the same curve of intensity over time. People don't all assign it the same weight in their relationship decisions. Especially across gender lines. Social and behavioral factors can be a lot more important than you'd think. Confidence, competence, humor, status. Cultural archetypes. Personal archetypes. Social proof. Trust, care, familiarity.

Will she sleep with him that night? Probably not. Would she agree to a date right away? Also probably not. Six months later, after a dozen group social events, might she have a serious crush? Decent chance. (Might his fast-burning infatuation be dead by then? Also yes, been there done that).