I have a question about chapter 5?

I assume you are referring to Weena?

From the text:

“She was exactly like a child. She wanted to be with me always. She tried to follow me everywhere, and on my next journey out and about it went to my heart to tire her down, and leave her at last, exhausted and calling after me rather plaintively. But the problems of the world had to be mastered. I had not, I said to myself, come into the future to carry on a miniature flirtation.

For, by merely seeming fond of me, and showing in her weak, futile way that she cared for me, the little doll of a creature presently gave my return to the neighbourhood of the White Sphinx almost the feeling of coming home; and I would watch for her tiny figure of white and gold so soon as I came over the hill.

Weena was anxious over the TT leaving because she was afraid of the darkness. Weena and her people gathered together in the dark and slept in a large group for protection. She had a difficult time accepting the TT's preference to sleep away from the group and alone.