Hi, me again... just a thought. She seems to be taking cues from your voice (I've read this a couple of times) so... what about using hand signals only? Words are really, for our benefit mostly. Those noises become associated with a behaviour for the dogs. You could ask a dog to "spaghetti" and if that's the sound she has association with the action "sit" that is what will happen. The grammar is our own, not theirs.
The next thing that I'm thinking is building confidence. It can be her tricks. A trick is, again, like obedience, a learned pattern of behaviour. So... I would start with the Puppy Stuff. even though she is 2 years old. Things like Puppy rule of 7. Eating on different surfaces, walking on different things, different textures in her mouth etc. Just always be ready to stop before she shuts down.
Reward behaviors you want to see again, ignore the ones you don't. She gets rewarded for moving off the front step, not running toward it in fear. She gets rewarded for staying the course meeting strangers, ignored for sitting between your legs. (I would, also, personally, try to move to the side if possible, so she can stay in her "safe zone", slowly decreasing this zone over time)Don't try to coax her out, don't try to baby-talk her back onto the lawn. When she makes her own progress toward the desired behaviour, reward. (click/treat)
Focus on what she is doing "right". Reward that, you'll probably find that this girly is so tuned into you that she will start to offer it more often.
As to the touching... I would find her break point. If she can handle 5 pats on the chest (start with a spot that is the least threatening) stop at 4 and reward. Repeat a lot! Move up to 5 strokes, then 10. When she tolerates that touch, get a little more vigorous, pat opposite to the fur growth, use the back side of a brush, then the right side, exhaust the choices. Know that each spot you desensitize will take the same amount of training. As her trust builds, you will find the repeats will be less. Keep a log, so you can see your progress. It will change faster than you may realize and it's always good to look at your progress.
You could try to smear peanut butter on the back of your hand, so she can lick it off while you pat, no pat=no peanut butter, if she backs away from the patting, she is removing her reward, her choice. . One baby step is better than one set back. Reward highly (whatever that is to your dog) finish quickly, and practice often.If she starts to react poorly, back up to the last spot she was comfortable, and get her happy there.
As recommended, the Examination Lesson is a great example to follow. You'll know you've got it when you can do this lesson!
PS, one other thought... if you think your dog could tolerate it, you could tether her to you with her leash. It would, I believe, help her to look to you for guidance and understand that you make the decisions. Most fearful dogs, need to know someone will look after them and make the decision.
