is there a pic..how late into flowering...if you can see where it broke and its still attached just tape it together it will live and heal itself...bad thing is you might up with a hermie plant but you will have feminized seeds from that plant.,all of wich may turn out to be hermies themselves but if givin a good life they should do fine and grow good plants...

good luck just tape it together if u can you could feed it some superthrive it claims to be very good for plants ive used it on my seedlings and they grew very strong compared to when i didnt use it...but use a fert thats has like 10-10-10 npk number...