you might be able to save the top by trying to clone it. It will take some time as it is in the flower stage. But you might get it to root. i have cloned from a flowering plant but it takes a little longer than a vedging plant to form roots. The rest of the plant, im not sure how big she is, but if the part that snapped off is less than one third of the total plant, she may perk up and put on some flowers.
Good luck
bump