Anyone has an idea why she started withering at th...

Well its hard to say anything about your plant, because having only one week and lack of information. so lets start " guessing" For me she looks overnuked, either to much nutrients, or a wrong Ph or both. I see burnt tips( to much nitrogen) i see hanging leaves ( probably overwatering) and tacoing leaves ( to hot). well shes grown under bad conditions , but weed can survivie everything, You wont win a beautycontest with her but she will give you a yield. No more nutes, just plain water.... very less water than up to now.. better is no water for a week ( it soil is wet), if soil is very dry its underwatering......Cupping leaves. try to rduce the temps in giving airflow, opening tent whatever..... and for the next grow use this.....https://www.growweedeasy.com/