Does the prayer become invalid if the worshiper moves three or more times to cover her hair that was unintentionally uncovered?

The aforementioned movement does not invalidate the prayer, even if it is frequent, because it is for a need upon which the validity of the prayer depends. Similarly, the prayer is not invalidated by the appearance of some head hair if it becomes uncovered unintentionally and is then covered immediately without undue delay, as is customary.