Well.....Power Girl appears on the cover of Tom King's Heroes in Crisis, a murder mystery about that Sanctuary thing where the Trinity took it upon themselves to stick heroes they think underwent trauma, and a few villains too. I missed it entirely on first glance, and didn't look carefully until a CBR article on the subject which mentions her being there, as well as her possible trauma, being stuck between two worlds as she currently is.
There's every possibility she's not in the story at all, (she's very small way in the back on top at the center on the cover BTW), or has a negligible role. Then again, this might be set post whatever rescue she has takes place and she might actually be in this.
One one hand she is very small, but on the other she is alone and noticeable. I'm not getting my hopes up, but fingers crossed.