Congratulations.
It seems like if it was loosing it´s attachment to the Peresquiopsis. I had a similar one that I loose, because after a week, the Digitostigma fall down but It was growing a small root.
I made the mistake of cutting again the root and grafted it over a new cut of the Pereskiopsis but It failed.
Maybe if I only planted again the seedling with it´s small new root It was alive today.
Alfonso