What should I do about my fiancée's obsessive thoughts about beauty, knowing that I chose her for her religiosity, character, wealth, and lineage, and that my mother praised her beauty without a hijab, and I had sought God's guidance regarding her?

Our advice to you is to accept the woman who possesses religiosity, good character, and beauty; for the soul is never content with what it has and always seeks more. The remedy for your condition is to stay away from places of corruption and intermingling, to lower your gaze, to treat your fiancée as a stranger before the marriage contract, and to frequently supplicate to Allah to make you content with your family and to turn your heart away from forbidden things.