Because we know Cordelia was just learning to drive back in the witchcraft episode.

Source: https://411mania.com/movies/stews-buffy-the-vampire-slayer-retrospective-season-1-episodes-11-12/

Cordelia will move up from her current position of deputy and hopes to boost the quality of teaching and learning, provide outstanding enrichment provisions and raise ambitions for its children.

Source: https://www.hampshirechronicle.co.uk/news/23336919.hampshire-private-school-sherborne-house-appoints-new-head/?ref=rss

Deleon Hayes is a great actress and having Cordelia come full circle from spoiled rich girl to slayer and possibly mentor – that would be awesome.

Source: https://tvline.com/interviews/slayers-buffyverse-story-cast-reunion-charisma-carpenter-amber-benson-audible-1235058308/

Represented by Mrs Cordelia Ihedioha, Onyema said that businesses that were heavily reliant on imports may face short-term disruptions due to the sudden shift in exchange rates.

Source: https://newsdiaryonline.com/nigerias-forex-market-needs-restructuring-tinubus-aide/

Whedon wrote Cordelia off 'unceremoniously'

Source: https://www.slashfilm.com/1421177/buffy-charisma-carpenter-begged-joss-whedon-stake-vampire/