Thanks for all the additional information. It is very helpful. There is a lot to cover. First off, if the dog has lived her life in a kennel with limited human interaction, the whole staying inside situation is unknown to her. Since she was an outside dog, she may have had another dog as company when outside as well.
As a result, she is probably uncomfortable being inside and is bonding to you. While you are sitting down, she knows that you are not going to be moving around, opening ovens or microwaves or running a dishwasher or the water in the sink, etc which would all be noises she wouldn't be used to. This would make her uncomfortable and under stress. It is perfectly normal for dogs to follow their human around. If I let mine, I would have 5 following me along with the cats. The difference is that most dogs would just come in and stand around or get a drink of water or even lay down until you left the room again.
This pacing inside should resolve as she becomes more used to the noises of everyday living inside the house. Ignoring the behavior is the best thing to do at this point. Once you have some obedience training, you can command her to come and lay down in a corner. That way you can reward her for obeying the command and teach her what behavior you expect of her.
You also do not have to wait for an opening. Starting her now will get her started on training and help her self confidence. If she has had limited socialization around people, the obedience training will also help her know what humans expect which help their self confidence and she won't be as fearful. The following site is helpful for teaching you how to train your dog. Be sure and click on the link to the page on obedience at the bottom. and links on subsequent pages leading to detailed instructions.http://www.schutzhund-training.com/training_theory.html
Training works best if you train at least 30 minutes a day (two 15 minute sessions). I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
You might try a DAP collar. They have them online and in pet stores. They use pheromones similar to the ones a mother dog uses to calm her nursing pups. This may help calm her down and be less anxious. Melatonin might help her relax as well. It has been shown to work well for noise phobias.
The car ride issues may be related to motion sickness. Some people use Benadryl to calm their dog before car travel and Dramamine is also used for motion sickness, but your Vet should be consulted before using Dramamine.
Benadryl can be given to your dog, the dose is up to 2mg per pound every 8 hours. The dosage for Dramamine (Dimenhydrinate) for motion sickness is 2-4 mg/pound by mouth every 8 hours. Any medication should be given an hour in advance to car trip. That may help with car rides.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.