She didn't seem to have any when she asked Crest to keep her company that night. It must be something else.
She didn't have the scar on her forehead before either though, despite the fact that she insists otherwise now. We do not know when the scar actually appeared, but I am guessing it is rather recent and not an actual direct result of whatever was done with her. Keep in mind that overnight she also went from saying she never had a scar there to saying it has always been there.
I had gotten the impression her excuse there was that whilst Crest might not have any problem with the bathhouse with the three of them, she has a problem with Crest being there.
Well, her jealousy IS infamous. When Maytag was "modeling" for Kin, and Suspira asked about a threesome, Kin reminded her that she got so jealous that the other partner left screaming, shaved bald and magically painted blue.
It's not so much Crest being there, as Crest being present in front of other nude women that is causing Suspira problems.
While there is something to be said for her jealousy, there is also something to be said for her rashness. Keep in mind that she did come with the idea for the threesome herself and probably would have gone through with it if not for Maytag's rejection and/or Kin's intervention. She also didn't mind Kin drawing Maytag nude, this too was her own idea. Her jealousy seems not to be a thing that inhibits her outgoingness... rather it tends to lead to disastrous conflicts afterwards.
Though she has been undergoing some big changes lately. She has been rather timid after Kin's death, compared to her outgoing personality when we first met her. This is of course understandable.
Yet I have a feeling her rejection to go to the bathhouse is not unrelated to her condition.
For now though we're following Bern. Less mystery in this part of the story, but I wonder what this conversation will bring. It seems her father is not quite the lowlife he seemed to be at first now that he is sober. Maybe he made some bad judgements in the past. He could have returned to the knights with the news about the swords being reproducible and the associated cost. He may not have had the swords, but at least it's a result. And the knights would probably have been able to find investors or even invest in it themselves. But pride is a tricky vice and I do have to agree that it is not very hard to grow bitter with the knights...