Willows character then evolves to have two specific traits. Firstly, she is still known for her computing skills (which are of use when researching particular enemies). Secondly, her magical skills are now considered as being fundamental to the scoobie gang (when helping to defeat various enemies). The main reason for this change, is the fact that Willows continued study of witchcraft, has helped to make her more powerful.
This is first witnessed when Willow impresses the scoobie gang with her ability to control fire: speaking a simple incantation that results in a BBQ being lit. Willows magic then continues to show its increasing power through the diversity of her spells, for example: erecting warding spells (to help keep “Count Dracula” out), breaking spells (that were cast by their enemies), bringing forward sunlight (to help light the dark), making use of reverse spells (to “fix” Willows own spells that have gone wrong) and moving a variety of objects (by force of mind alone).