DO NOT FEED if there is ever a question of power going out for feeding day or the two or three days afterwards. She'll be fine! I never feed when snakes are blue, and that means my 5 gram baby just missed two meals, and she's shed and is just fine. I'd think about getting some hand warmers. You can't put those directly in with the snake- you have to put one in a plastic container, with holes so it gets oxygen. Then the snake can find it. (Holes too small for the snake to get through, of course.) Don't think about doing anything like carrying the snake with a hand warmer on your body- hand warmers are hot enough to quickly kill a snake. WAY over 100F.
In the future, you can order a pack of 40 hour heat packs from Superior Shipping. They, too, need to be kept from direct contact, but are a lower, longer heat than human hand warmers. (Still, over 100F).
If you have to leave, to go to a hotel or something, do not leave reptiles behind. You can easily bring a snake anywhere in a deli cup or small cloth bag (knotted) in your purse or a small cooler. An emergency evacuation set up for a snake would be a small cooler, a deli cup or bag for the snake, possibly a deli cup with a hand warmer, (but you need to get fresh air in, for the snake, once in a while). A better solution would be to obtain an item called a Phase 22 PCM panel, which is a plastic square with a gel inside that stays 70F after you pre-heat it in 90F water until it liquifies. You get these from Josh's Frogs. You can also use it frozen in the summer, if you're stuck with no AC in temps over 85. Then, ideally, you'd have a probed thermometer with the probe inside, and the thermometer base taped outside. You can get all kinds of cheap probed thermometers on Amazon for $5-10. Always have the snake in two containers, in case if gets out of one. The snake's feeding container is often appropriate for an emergency evacuation home.
If you and the snake are going to be away more than a day, I'd offer the snake a drink of bottled spring water by pouring water into a bowl and floating the snake in it. Easier than trying to set it up with a water bowl in temporary quarters. If the snake needs to drink, it will drink. If not, it won't, and you don't need to worry about that. I travel with snakes all the time.
You can even order a reptile shipping kit from places like LLL Reptile- which would include an insulated box, a heat pack, a cold pack, and a snake bag. Almost everything you need to take your snake and leave. Again, I feel like the thermometer is important, because it lets you watch the temps without having to open the box/cooler up all the time.
I hope you make it through the storm safely, without too much trouble.