Ball pythons like to feel secure that terrarium looks huge even for an adult. An adult python is perfectly happy in a 36x12x18 space. I'd definitely clutter it up more and add a lot more hiding spaces so she feels secure.
Ball pythons need a hot side with a average 90 degree temp at all times and a ambient/cool side temp of 80 degrees at all times. And a secure hide on both sides. You should be using a thermometer to measure and control these temps. The humidity should range from about 50% normally to around 70% during a shed and they should have a water dish with enough water/space to soak in if desired. Over 95 and under 75 degrees will become dangerous for your snake. They also need a day/night cycle. I don't use white light, I use red heat bulbs as they can't see red light and it doesn't disturb them.
The biting is from fear, her naturally instinct is telling her that giant thing coming towards her is going to hurt her and regular handling and age will calm this.
Also, ball pythons tend to be more skittish during sheds due to the "blue eyed" stage when they are mostly blind. Handling during this time may induce stress which can cause bad sheds and poor appetite.
On a side note, giving your new bp a week to settle in and get used to her new surroundings with out being handled or bothered except to change water, remove poo etc. Will help calm her and reduce her stress. I personally wait to handle my newbies until 48 hours after they have eaten their first meal for me.
I hope this helps.
1.0 ball pythons - Koba
0.1 pitbull/lab - Cinnamon
0.1 collie/elkhound - Fluffy
0.2 children
1.0 boyfriend