Tbh, I think the moment she and other girl were kidnapped and raped they adjusted to their world a lot quicker than Ren. I don't think she's completely hypocritical b/c it felt more like she couldn't fight back, like most of the other characters (little training). It was maybe more in the beginning where they just didn't want to, but now after the fact it's more like they don't have the fighting experience, which will change? I think from here on she's got similar mindset to protagonist while Ren is still stuck with his modern anthropologist idea of respecting culture and not wanting to tamper with timelines. Imo I think she's the most qualified to slap him b/c she was a part of his world (the past modern ethics) and has experienced the cruelty of this world. Yeah, Taiga got on it quicker to adapt but tbh he was never really attached to their world, he was kinda drifting whereas the Ri and Ren are. One has just adapted while the other is holding onto his fears and modern "ethics."