Hi, its tricky to say what happened here, because of only having 2 Pictures, to do a serious diagnosisi, you may need more than 2 pics. otherwise its abig guessing game .
Your Girl looks droopyand not happy. There are a number of reasons why aplant looks like this. We start on overwatering// underwatering, to much fertilisers... and we can go on with windburn etc....... you see=? i let you a flowchart so you can do selfdiagnosis
https://www.growweedeasy.com/wp-content/uploads/2014/09/cannabis-plant-problem-flowchart.jpg