Guilt
How strange.
Heaven had been racking her brain about how to get along with her son. The original Heaven was resentful, and the current soul just didn't share the same sentiments as the original Heaven. From their outlook on life and upbringing, they were very different in every aspect of life. The only similarity they had was that they were both inexperienced in being a mother.
The original Heaven only birthed the child. Other than that, she did nothing but glare and resent her child. Meanwhile, the current soul did not birth, nor did she ever have a child of her own in her original life. Although she always dreamed of having a family of her own, people often told her that birthing her own child and adopting was different. Moreover, considering the environment she was moving in, bringing a child into this world was not a smart move.
That was why she found it very strange.