I realized something and I really wanted you guys to know about it. So I think there's a reason Zoë got put amongst the stars, a deeper reason, one that I am going to share with you today.
So, Zoë went amongst the stars, the stars are in the sky, Atlas holds the sky upon his shoulders, therefore Atlas has to forever live with the fact that he killed his daughter and have the weight burden him further.
This also means that Bob envys Atlas for being so close to his granddaughter when Atlas killed her.
In conclusion the weight of Zoë's death is on Atlas' shoulder quite literally.