If you want a cheap and easy way to cool down the room you could try getting one of those big box fans and put a couple two liter bottles filled with ice (freeze them) behind the fan to help circulate some cool air.
I know money can be tight sometimes but there are a few simple pieces of equipment you just can't skimp on. You NEED a thermometer in that cage. Time to gather up your pennies and get one! The best thermometer for your money is the Accurite weather station. It has a probe for measuring the hot spot, and also measures humidity and temperature at the unit. It costs about $11. If you can't afford something that is required and only costs $11, then I don't know what to tell you. I hate to say that you should pass on the snake to someone more financially stable, but that would be my advice. I know you are trying to do the best with what you have, but you do need a little bit more.
Also, I would defiantly get her some new hides. The half log hide does next to nothing for making your snake feel secure. Here is what I would suggest. Head over to the dollar store (surely you have a dollar?) and buy yourself two plastic bowls that you think the snake would fit snugly under. I usually find these bowls in a two pack which is awesome since you want two identical hides. Cut a small hole for an entrance and smooth the cut edge with a lighter. Then cover the back and sides of your tank with some black construction paper. Any color will do really. The idea is to make your snake feel less exposed.
A few simple adjustments can really make a difference in the snakes behavior, but it will take a week or two to notice the difference. Snakes can get stressed and pissy when you make changed to their environment. Good luck!