EMERGENCY, JUST NOW, TOP OF KOLA CAME OFF IN LAST MONTH OF FLOWER. WHAT CAN I DO TO KEEP HER ALIVE?

First, I am sorry to hear that happened. *You could try using plant grafting tape. I have used it when i have cut stems almost completely off along with grafting tomatoes with potatoes. The tape allows nutrients to continue to pass thru the stem. *You could also try to treat the clipping as a clone and place in water with a tent to keep it fed until it produces some roots. Unfortunately trying to save the bud with grafting tape may impede the plants overall bud growth as it is trying to repair, or it may not take amd just slowly die. Going the clone route may put you at risk of bud rot if the humidity gets to high. Sadly It might be better off just cutting your losses (no pun intended) if you still have a large portion of the cola left. I wish you good luck and hope that it works out.