How can this be? Help?

Ok so i have a problem one of my nice and big white widows are dying it appears, and its in flower stage right now. The temperature is at 60 at night and during the day gets up to 68 70. Do you think its from a lack of warmth? because last night it looked fine then this morning it was all wilted??
Any help would be greatly appreciated.
Also this is a first time thing because all of my other plants are up and fine, thats the only 1 thats having a problem

Won't be the temp changing at night, because thats natural, you need some pics on really

well, fuck all i have is this shitty camera phone, but umm it looks like its in shock as if i just pulled it, and there are no fugi or mold or you said its not the temp? because i didnt think so either. i use the flora blend for my nutes, keep it a 6.0 out of i believe like 20 or so plants thats the only 1 dying like that

let me take some pictures and post em for ya