Lack of emotional bonds doesn't have to mean lack of emotion, or lack of caring about things other than people. She could have a certain attachment to things that have always been there, for feelings of security or whatever; it's not nearly as strong as personalising
an object or something like companionship, just maybe something along the lines of having a favourite knife without feeling like naming it
or talking to it. People could be treated in the same terms; she's used to them being there, only now they're suddenly not, and she has to change her expectations.
This might be considered too much of an emotional bond, granted, if you want her to completely lack that capacity. In that case, her emotions could be far more in-the-moment. Great, now she has to get rid of the bodies before they smell. Ugh, but now the neighbours are rotting and no one's there to clear those
bodies, and what good is that? She could really use an extra set of hands here, and it would have been nice to have someone help.
When people come by, she might just avoid the topic as much as possible, and dodge around things. She doesn't even have to feign tears that way; it won't be improbable if people just think she considers it too painful to talk about, especially when survival requires putting emotions aside enough to function. It's likely the survivors will have had to do the same; they did survive, after all, and adapted. And she can treat anyone being too emotional for her taste like Wangst
and get irritated and bored. Or she can be concerned that she should be acting like that and mentally take notes.
You will not go to space today.