I think this series is at its best so far when it's doing its brooding, atmospheric character development in moments of quiet, but it's kind of agonizing to read serialized. It
feels like we're getting loose ends introduced faster than we're making forward progress.
I really get the sense that her opacity is a deliberate choice, and I'm really curious to see what it'll wind up being in service of. A way of representing her own unresolved or unconfronted feelings? Big reveal that will recontextualize a bunch of stuff we or the MC thought we knew? Small reveals that will parallel MC's getting his own life straightened out? Representation of MC's lack of insight? Just a mysterious tone thing?
She doesn't work at a hostess bar, she's a bartender at a concafe - they're at the opposite ends of the spectra of price and innocence, totally night and day. Even if she's wearing a bunny costume. They made a whole (implied) joke out of it last chapter. Might be the best-paying job to support herself after "housewife" fell through. Tending bar is a great way to pay for school, for example.
For her tone when she mentions being a widow, I've
mentioned it previously, but I don't think that's the message we're meant to take, and I hope you'll read the linked comment and keep it in mind if you meet someone with a similar reaction irl. And from a storytelling perspective, I think her tone and mindset are meant to mirror the MC's, where he talked about the implosion of his career as a mangaka in a similarly detached and unemotional way.
Granted he went into painful detail and she used it to redirect the convo to a chapter-end cliffhanger.