If i have a branch break i re support it in any way i can to get the broken part back into its original position then wrap it in wet paper towels to keep it hydrated while it heals. You can even use saran wrap/ whatever to help keep it moist. No scientific links to validate it. Just personal experience.
Duct tape works wonders too. It’ll help keep it in place and allow fluids to flow. You’ll know within a day or two if she’s gonna die. Hopefully you can save her.
Tape her back up, feed cal mag and silica. Add Mollases to the feed. I’ve seen this help mend broken stems quite well.
Keep her hydrated more then usual for about a week and keep that area supported duration of the grow. Stake etc