My niece talks to herself a lot to the point where I am not sure if it is normal or not?

Yes I know that talking to yourself is totally fine and even having conversations with yourself is. Sometimes you just speak out loud or need to think clearly.
The thing is that she is always talking to herself and she has full on conversations all the time. She can’t seem to stop talking to herself sometimes. I’m not sure what she talks about but she does do it and I’m not sure if I should be concerned
My niece talks to herself a lot to the point where I am not sure if it is normal or not?
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