82 = 27 Celsius which is a little high but still within the safe range i think, tho this can depend on Plant Pot size, Room Size etc...
Don't think you watered too much or too often(though again..Variables..Plant Pot size(Pot Bound?Aeration) Room size and Temps..
One thing..did you water before trying LST? reason i ask is I'm sure i read somewhere that it is better to NOT water before each LST...you know let the plant start to wilt/droop a little..Do your LST then water..The Grower that said this was because less stress on the plant..ever noticed how plants stand Tall n Proud when been watered...so by doing LST when Plants are due/need a watering they are more supple..
Just a thought....
Hope she picks up...
Nearly forgot what size Plant Pot she in and how long been in Veg
Peace