And if you don't care at all, you can let her die alone without noticing.
I would argue that letting her die Not Alone is a thing that should definitely stay as an equal alternative to Avernus regardless of better endings added (assuming any).
It's been very clear, looking at people's opinions, that for some staying with her as she dies felt like a better and more loving option that pushing her back to Avernus. It's a personal thing changing from person to person, yes, but it's definitely not only a "if you don't care" option. Some people care in such a way that makes Avernus a no-go for them, but making sure she dies loved feels cathartic and right.