Or it could be Supergirl’s version of Barry’s fight with the Speed Force in The Flash, which ended with characters living in a dimension with the Speed Force, so she wasn’t lonely.
It’s not a sure thing that Supergirl will turn out this way, of course.
Trust me, Supergirl fans don’t want an equivalent of that storyline.
And who knows, perhaps the Supergirl writing team found a way to make Kara’s emotional link with Nyxly riveting, and we’ll get some real insight about both characters in these final episodes.