I suspect the two issues are ones already mentioned, she isn't feeling secure in her enclosure and the food offered is too little.
For most animals bigger is better when it comes to enclosures, but not for ball pythons. A BP in the wild lives inside a termite mound... Very little space, very dark, and very secure. Open space will stress them out. Hides that are too big will stress them out. Ideally the hide should touch them on all sides, including the top. Even a little stress will make a snake hesitant to feed.
The next issue is prey size. You mention a "3/4 the widest part of body" rule. The actual rule is it should be the same size or slightly larger than the largest part of the snake's body. It should be big enough to leave a visible lump when swallowed. But even that is more for adult snakes.
For a snake under around 250 grams you want to focus on feeding 10 to 15% of body weight. So if she weighs 103g each feeding should be 10 to 15 g. A pinky mouse averages 1 to 3 g, so obviously FAR to small. Even the next size up, a fuzzy is usually 4 to 6 grams. Your snake should be eating a hopper sides mouse (usually 8 to 12 grams) every week.
I would put her in a much smaller enclosure, even a shoebox size, and keep it very dark. Don't handle for at least a few days. Then offer a hopper sized mouse. Make sure it is warm all the way through, as well as dry. It sometimes helps to warm the head up with a hair dryer right before feeding so it is really warm.
Deborah on this forum has a phenomenal plan for picky eaters, it is stickied on one of the threads, husbandry I believe.
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