and her father finds out about her promise or pledge but doesn't say anything to her, all the promises or pledges she has sworn to do will stand.
If a woman who's young and still living in her father's house makes a solemn promise to the Lord or pledges to do something by swearing an oath
But if her father disallows them as soon as he finds out, then none of her promises or pledges remain valid. The Lord will release her from keeping them because her father has disallowed them.