Something bugged me after reading the Christmas story. 3 powerful beings of fairy visited the Carpenter family home that night. Only 2 should have been able to freely enter with out spoken permission. It is Mols family home she is good. The mantle of Kringle could freely on that night by his normal means (fire place, with a gift). Mab appeared magically, with out spoken permission. That would be not possible  in a normal morals home. Let alone one protected by the Heavenly Host. Michael seams like he gets a message, smiles and walks away. He never invites Queen Mab in. She would have Had to Strike a deal with an agent of the WG (most likely Mr. Sunshine) to part the super threshold.

So what might it have cost her??? (or did Jim forget how well he created his worlds rules)