First off, nice job rescueing that litte baby BP! Secondly welcome to the site, there are a lot of threads that will answer any question you will ever have. Your baby sounds to be no more than 3 or 4 months old and is probably around 150 grams i'd imagine. The temps are a little low, but untill you have a digital accurite thermometer, you wont be able to know exactly how hot it is, its probably near 90 at the hotspot. The humidity is perfect and you can use either foil or a towel to keep the humidity in. Don't feed her yet as the stress of the ride could cause her to regurgitate.

Try and keep the enclosure cramped and if you can go to Dollar General and pick up some blastic bowls, they have a small bowl thats perfect for a ball python that size. Stick 2 of those in there with a water bowl and the foliage you said you had.

Good thing you have held the baby yet, i wouldn't. When you go to trasport your ball python buy a 6 qt container from target or walmart to put her in. The smaller the container the better so she feels secure, i think a 6 qt would be perfect. Make sure the container isn't airtight or just put some holds in the side with a soldergun or whatever you have. make sure she isn't near any drafts or open windows and if possible put home hand warmers under the tub while on the road. Personally i burn my self up making the car warm enough when i travel with snakes in the vehicle, but some hand warmers could do a good job. Any other questions or things i missed, i know someone else can help fill in.