You could cut it off clean, and put the top in a bucket of water with an airstone in it. I'm not sure of any root hormone that you can put in the water, but I'm sure there is one. Use that, and hope the top half pops roots.
You could also try to splice it back together, as if you were grafting, but it's the same plant of course.
...but more than likely she's fucked. Hope you have the technology.Good luck.