'Agatha is just Billy's sidekick now!!'
What are you talking about?! She gets to be a mother!! To this kid that reminds her of her child! Who she's grown to care about!! Who doesn't blindly trust her, or blindly hates her, but at every turn has tried to understand her!! Really understand her.
Sometimes women are mothers and mentors, not because they have to or have been 'reduced' to it, but because they choose it, because they're good at it, because they love it!
Agatha is THE maiden mother crone! She's the spirit guide!! And thats so fucking cool, why would WE reduce her to just a sidekick???
Also, in what world would our asshole witch not l o v e being the snarky hot ghost wine-aunt talking shit over someone's shoulder?