From that picture of her, she is not that scared of a hedgehog. Very defensive hedgehogs tend to not uncurl and look around at you like that. Continue to spend lots of time with her, and be patient. Offer her mealworms to help promote bonding. If she won't take them from your hand, put some mealworms in a bowl in her cage. Do this for a few consecutive days, then offer the mealworms to her in the bowl but hold the bowl. If she huffs and puffs at you, just hold the bowl still, chances are she will eat from the bowl. Keep doing that, and as time goes on start offering them to her by sitting them in front of her. She will quickly associate the yummy mealies come from you, so you must not be too bad right? Show her respect when she acts defensive. If she doesn't like to be petted, don't pet her, etc.
I have taken in extremely defensive hedgehogs, some that were biting and had them turn into love bugs. I have one right now that was given to me because he is not social. His old owner felt I could help him live a happier life. I wish he would look at me like yours does, but he huffs, puffs and clicks for long periods of time. After 3 weeks, that period of time is already dropping quickly. We have a long road ahead of us, but I see in him signs that we can break through and he will at least be more social than he is now.
So yes, with the proper amount of respect, patience and interaction an older, defensive hedgehog can turn into a sweetie. Not all will, because some may just be that way naturally, but it can, and does happen. Also don't expect that change to happen in a week or even a month. It can take truly defensive hedgehogs a long time to trust you. You have to be ready for a long ride, and should it be shorter, well take it as a pleasant surprise.