My daughter is 12 years old. She is an introvert and was having issues making friends in the past, but now she has a few friends in her school.
She keeps walking around the house (sometimes for an hour) talking to herself and I think making conversations in her mind. What I hear is just humming.
I asked her once what she was doing. In response, she laughed and said "nothing" and seemed to enjoy the attention I gave to her humming.
Since then I have not asked her about her humming and talking to herself as I don't want to encourage it.
I wonder if I should be concerned about that or if this is normal.
What shall I do?