If the cool side hide is one of the 1/2 logs with two open ends, you should replace it with something more enclosed. Also, keep in mind that when she grows there is a chance she could get stuck in the tree hide (I'm guessing it the one that has a smaller "hole" in one of the "branches".
For humidity, get some shallow plastic dishes and put moist sphagnum moss in each corner of the tank. The plastic dishes keep the bedding from sitting wet. Covering the screen lid with a damp towel is a good idea, you can even cover the towel with foil as well - just make sure the towel is not touching the heat lamp. Make sure that three sides of the tank are covered with dark paper on the outside to make it feel less open.
I also really like terra-cotta pots for adding a moist hide - I have pictures in my gallery. You just drill out the bottom of the pot and set it upside down in the drip pan. Then line the bottom with damp moss - you can also soak the pot itself in warm water for an hour or so which will slowly release the humidity throughout the day.
That feeding chart is a great tool, just make sure you get a good digital scale to keep track of her weight. If she has been eating mice it may take a few tries to get her onto rats, which are more nutritious. However, don't attempt to switch if she is skinny. Having her eating regularly is more important at the moment than switching to rats. Some snakes refuse the first few times and if they don't have enough fat stores they can loose too much weight in the process.
And get digital thermometers / hygrometers as soon as possible. The round stick-on ones are inaccurate and dangerous to the snake.
My biggest tip: AMAZON is your best friend
No cage is too large - nature is the best template - a snoot can't be booped too much
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