adywan said:
Sadly they strengthened the bond between Ben & Leia which makes her reaction to his death in ANH even more cold.
This could be a decent explanation for why she doesn’t react the way you think, especially after witnessing Alderaan’s destruction, which had only just happened before Obi-Wan sacrificed himself. She’s just a little better at coping than Luke is.
https://www.cbr.com/star-wars-annual-2-reveals-how-princess-leia-copes-with-spoiler/