I'm going to be more blunt than Howard.
Your hen is bossing you around, and doing a great job of it. You're letting her call the shots and be the boss of you.
It's not that she doesn't trust you.She's not mad at you. It's that she now knows she can tell you what to do, and you'll do it.
Don't let her peck you anymore. For a while, that may mean not letting her get close enough to touch you. You're the human, you decide when she comes close to you and when she does not. For now, she does not. Shoo her away, chase her off, whatever you need to do. You're not going to scare her or make her afraid of you. You will make her respect you, and that's a good thing. Don't hand feed her for a while. After a few days of not letting her close to you or giving her treats, pick her up. If she pecks at you, flick or thump her with your finger. That's not allowed, ever. When she's settled down, you decide when to put her down. She does not decide, you decide. Pick her up when you want, put her down when you want. Eventually, after a few weeks, you can try hand feeding her treats again. If ever she pecks you, flick or thump her, and don't mess around with it. Do it seriously enough she doesn't want to be around you. It's exactly what she would do to another chicken.
Lots of folks want to treat chickens as pets, but their brains are more livestock than pets. They just don't think the same as say dogs do.
Again, she will NOT be afraid of you, but she will respect you.