With much regards to the appendages to the relationship abuse, I think she deserved every ounce of retribution. At this point in the story, I don't think the room for growth is large simply because she's immature, she's too narrow-minded to the cause, and she's also persistent with the "I know you love me" shenanigan, it makes my blood boil every single time she's hung up onto this narrative. Like, don't you have self-awareness, woman? Seriously? I absolutely do not condone violence, but if there's ever a chapter where Ichinose would get physical with her, like a slap to the face, I wouldn't be surprised. He might've harbored anger from all the agony he's endured and couldn't restrain himself.
Also, just to add, the "trial-date" thingamabob is dumb. Very. Date her for real, if she does not like the way the relationship goes, either of you will handle it, talk about it, and get a closure. And yes, I agree with some comments that with or without them dating, Yukishiro will most likely will be a target once again of another orchestration of Hanabi, so as a new anchor, Yukishiro can serve as a bulwark for Ichinose, and he, in return, can protect her from any adversities. I kind of wanted to see a development between them, just to see where they would take this road.