In the episode "Why So Blue?" I as well as others think when she talks about fusion in her song, it's basically hinting that we won't get to see her fuse with someone again. I know some people are bummed out about this and the possibility that we may never see another lapis fusion but I'm proposing a new idea. What if we got to see more lapis fusions, but it wasn't OUR Lapis??
I mean think about it, we already have a new Lapis attending little homeschool, and as far as we know she hasn't had much trauma, she seems pretty happy all things considered. Who's to say, we might see her get into fusion? Maybe even a more stable Malachite could form if she met Jasper and ended up befriending her? Either way though it's just food for thought. It kind of just feels like she's the inverse of our Lapis, I feel like the more we see of her (if we see more of her) then the more she will appear to be this inverse of our Lapis' personality! :0