I think the car scene might be a misdirect, but Idk anymore. At the very least, she's very clearly a character who is a nod to Agatha Harkness, but the name Agnes could've been the biggest misdirect, leading everyone to assume her identity, when she was just the "nosy neighbor" all along? I actually sort of want Agnes to have just been a misdirect the whole time now as I think that makes the show's mystery all the more intriguing.
For a show that started off as such a slow burn without all that much to speculate on, I feel like it's just question after question after question now without many answers. And we had an entire episode in Episode 4 where things were confirmed for us, too