User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Merlin's Mum Hunith/@comment-4623180-20120307135627

Those are some marvelous questions! Hunith is rather calculative, I would imagine, if she needs to, so she was probably just sweet talking to the king. Maybe she didn't know Uther hunted Balinor? As for him threatening Merlin with his laws, Hunith had to put that aside.. He was her only hope.

As for not explaining Balinor in 4x12... I NO RITE!!!

She better appear in Series 5. I'd imagine it would be odd for Merlin to suddenly walk up to her and tell him he'd met Balinor, so maybe in one scene she could reference a discussion they had during the events of 4x13 that wasn't shown in the episode. This would confirm any assumptions or predictions that that is what they were talking about from the day Merlin arrived in Ealdor up to the night when Agravaine surrounded Ealdor, and Merlin had to leave.

As for the lack of appearance, very odd indeed. Perhaps the actor wasn't available or they had to cut a lot out?