I can offer a couple of suggestions to you.
First is don't move your snake to feed it. It isn't necessary and can cause problems with picky feeders.
Second is as hard as it is, wait at least 5 days before you offer again. Do not handle or mess with her in any way for those 5 days.
Thirdly, try in the early evening. Balls are nocturnal by nature, and in the wild they get active after sundown. I get the strongest feeding response from my 17 balls at around 8:00 pm.
Fourth, when you feed her, just open her enclosure, drop in the mouse, close the lid and back off. Sit down at least 4 feet away and don't move. A hopper can't do much in the way of damage to a snake, so only interfere if the mouse is actively attacking the snake.
In my experience these guys know when you are stressing about them not eating, and will deliberately not eat just to stress you even more.As hard as it is, keep your cool about it. When you go to feed her, just tell yourself it doesn't matter if she eats or not. Make yourself not care. If you can make yourself relaxed, she'll be more relaxed.
Let me know how it goes. Believe me, I've been through 9 month long feeding strikes, and it's really frustrating and very hard to deal with. Don't give up hope just yet.
Gale