Meh. Let’s be real It’s not like Cordelia was close to them in the later half of season 3. When she and Xander break up, she reverts to form and starts treating them all like dirt again. She makes The Wish, constantly insults Buffy and Xander. She only really comes through in the Prom and Graduation. In Angel season one in the first crossover episode I will remember you she is extremely dismissive and insulting towards Buffy in a conversation with Doyle that actually makes Doyle question if she’s jealous of her. Then in a conversation with her in the same episode she’s also dismissive and “ you can’t have everything “. They aren’t friends. Cordelia has consistently been a jerk and it’s actually surprising in season 2 that she even called Willow at all about Harmony, but not surprising that she assumed she was , in her terms, a “ lesbo”. Why would the scooby gang be thinking of Cordelia when they have their own world ending stuff to deal with and she peaced out to LA, has made it clear she doesn’t like them, and Willow is aware she works for Angel and therefore is suitably protected?