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Hunith was probably constantly worried about Merlin. She did all she could and she new Camelot was dangerous but she didn’t know where else to send her son. Her only child she had to send directly into the line of fire.
Do you think she waited for a letter from Giaus saying he got caught? Constantly worried she would lose her only son.
Then when she finally gets to see him again I bet she was so relieved because he looked okay. Sure things were hard being the princes manservant and all but he was loved and she knew that. Even after see just how much Arthur cared about Merlin she just waited for that letter.