As long as there’s green, there’s hope, they are strong ladies 
. I’m going to spam a bit your thread with a story of survival.
I planted some seeds in one of these starting kits. First I cleaned it over, even flushed the water pump with peroxide BUT (my bad) I reused some sponges of seeds that didn’t germinate at all, and that was a disaster, there were spores in those sponges, the water was all green and the plant’s coitus …
Many days later I wanted to clean egain the kit and I noticed one of them was still alive 
after living without LED light and dumped water for more than a week:
So I planted her in soil, trimmed the upper leaves (nowhere to go) after a certain time and there she goes as twins:
I guess no one has tried that kind of topping 
, the moral of the story is that as long as it is alive keep an eye on her and good luck … 