Madison and Anna are both witches and actors. It's an alternate reality. There are dimensions to it. We could have been watching Madison's dream or her new life after her death.
No, Anna is not a witch. Maybe she got powers at the end of this finale, but she was not a born witch like Madison. Both are completely different women but exist in the same world. In this scene, it is 2024, and Anna Victoria Alcott is here in this room, while Madison is probably being a council member at the academy after most likely being resurrected by now by her sister witch Mallory.
I think I understood the finale (finally). •I think Anna won against Siobhan because she didn't trust and didn't love a man (a very disgusting one too). So I think her holding the baby and the Oscar is like saying "she could have it all, but only once she decides to do it by herself, without a man consent or help." •Siobhan is Yahweh, since Siobhan means "God is great" and has the same etymology of Yahweh, Joshuah, Geova, etc. In many apocryphal gospels, Yahweh or Demiurge or Satan are the same entity. So basically she's the Devil because she's Yahweh, which is not a real God, or at least, an evil one. Anna, on the other hand, becomes the new "Satan" but in a pagan and good way. •Basically, the Universe is run by Women Deities and Men are just tools to get sperm from and doing what frminine devine energy can do better: create. This time, though, Anna is going to do things differently, by herself and having it all, without a man getting on the way. •Siobhan, on the other hand, is defeated because she uses but also trusts men and has children by having segs whith them. If you get close attention, in fact, Anna is the only one surviving - I think the other witches rather died too or submitted to Anna - because she had a baby with artificial insemination, so she remained "pure" (not even Adeline survived because she got pregnant naturally). •Basically the message of this season is: DON'T HAVE A HUSBAND/BOYFRIEND AND GET WHATEVER YOU WANT BY YOURSELF, BECAUSE MEN ARE USELESS. LOL.
Too late but here's Ending Explained from Reddit: In episode 7, the witches circle Adeline, Ivy says "You have no power other than what she gives you" then Sonia says "and takes away". So Adeline had power, it got taken away by Siobhan once she left the cult, which explains why the chant failed for her at the restaurant, because she didn't have power. Siobhan later gives Anna power when she accepts the baby and is given the green heels. Anna is able to cast the chant/ ritual at Siobhan with the power Siobhan gave her. The witches are bloodbound, and die together.
Kim's acting in this season was so terrible thank God Emma Roberts carried this season don't ever hire Kim to be apart of another season ever she can't act