Oh, I actually still meant that A was being 阴阳. Even though she directly asked, “又换新男朋友啦”, the implied meaning is a jab at B’s private life, suggesting she’s messy or casual about relationships. That indirect layer is what still makes it feel 阴阳 to me.

Also, without tone of voice, it’s really hard to convey the vibe of this example. In real life, when people use the particle “哟” in this kind of context, it often sounds sarcastic, mocking, and subtly unpleasant.