Hey there Jabz, you're right to spot this as a problem. So this is due to overwatering. What happened is that humidity got trapped towards the center of the pot and water mold appeared causing root zone issues which in turn causes the droopy leaf symptom. You do need to stop overwatering, probably you can wait 2 to three days between waterings. Try the lifting pot method to never overwater again :
www.youtube.com/watch . Then keep monitoring the plant, just by following a strict wet/dry cycle the plant should fully recover quickly, but if it doesnt what happens is you have to break down the problem roots with a chelation agent like humic acid or enzymes which are common cannabis products. Hope this helps ! 🚀