Is wiping the entire head in wudu preferable or more cautious, and is it permissible for a woman to wipe only part of her head due to adornments or the difficulty of undoing hair ties?

The most preponderant opinion is to wipe the entire head during ablution, and it is recommended to avoid scholarly disagreements. A woman is permitted to follow the opinion of those who say to wipe part of the head if there is adornment or difficulty in untangling her hair. This is the madhhab of the Shafi'is and Hanafis, and one narration from Imam Ahmad.