Bearded Dragon Aggressive Hissing

Frankie, our beardy who we ve had for almost 2 years, showed her first signs of aggression this morning. I opened her vivarium to feed locusts and it was most unwelcome. Granted, she was probably a bit too cold as he tends to play her heat lamp and blew the bulb yesterday, this may have contributed towards her very defensive mood this morning. We do have a heated mat under the sand which she wasn t on, I tried to pick her up and put on over the warm area, but really didn t want to be touched Like I said,