I think in this case, because as you admit you are new to training and are not sure what to do with this horse, finding a local trainer who can help guide you through the process of working with her! It is very easy to do more harm than good when you are not sure how to handle a horse's issues, no matter how well-intentioned the person working with the horse is.
I think the first issue you should be addressing with her, which will likely build up to fixing your other problems, is the matter of respect. From what you posted, it sounds like she shows you very little. When you are training a horse, you cannot simply ask that she do what you want. You need to make her do it. This does not mean to be rough, but it does mean to be firm when you do not get a response from a more gentle cue. Of course it is also important that you are communicating with her correctly and setting her up for success in your training sessions.
With a horse like this, where she has been ridden but has had years off and obviously now has few manners, I would start from the ground. First I would do in-hand work on a lead-line with walking, stopping and trotting. I would work until she responds to gentle cues and voice commands. Then I would transition to work lunging, again making sure she moves off and stops easily on cue. I would not get on this horse until she improves on the ground and is respectful and quiet both tied, standing in-hand, being led, and being lunged.