Fortunately I had another house to stay in (Saratoga - who knew THEY had power for once!) and dragged her baby tank- 29 gal - and set up shop for her that way. Checked on the house frequently (fat cats - they were fine) - and the water got to the 50's, at most. I feared the worst - an ice skating rink in the tank, then expansion resulting in the glass cracking. Ugh. The house only got to the 30's one night so no issues...phew!
This was the first time I've lost power for more than several hours in my life. A neighbor had a wood stove and offered to take care of her for me! Very sweet, but I was a panicky mom and needed to keep an eye on her, and I knew I could plug in a heater in her small tank. Good thing that small tank was fine - it hadn't held water for 10 years, and 8 of those my anole lived in it!
Didn't take as long as I thought it would to bring her main tank's water back up, phew! However, if it happens again? Dunno.... bring her to the neighbors house - a close-by wood stove is better than nothing in an emergency for warmth?
