To add onto this:
It actually proves she is completely unsaveable.
Look at what she says closely during the himawari event chain, barring even her venomous insults towards Ayane, insinuating that shes keeping akira from her, and has effectively kidnapped him.
At first she tries gentle manipulation, "oh i just happen to be in your town we should see eachother" as if shes not done it on purpose. She employs a huge array of manipulation strategies, she blames ayane, she tries to guilt trip akira, she tries to downplay the significance of what shes doing, she makes several backhanded insuniations. Its bad.
But man, if you ignore the things shes saying and just LOOK at what she is doing it is WAY more on the nose.
First thing first, she is wearing Sekai's dress, having not moved on from her past at all.
Secondly she is on the phone while driving, having not learned from her past either.
Thirdly she is attempting to use himawari to get back to her dad, more manipulation. The very thing that led to this outcome to begin with and cementing ayanes stance on no contact.