How about waiting 5 days before retrying. Just keep in mind that too often can backfire, but you're seeing & working with this snake, so use your best judgement. But also bear in mind that in the wild, these little snakes don't likely get food anywhere near as often as what we provide, & as with humans, hydration is more essential to life than food. (both are awfully nice though, lol)
I agree she doesn't look emaciated, but keep in mind that a stressed snake (like when being handled) often inflates so they don't look as thin as they really might be.
Keep a dose of Flagyl in mind or ask your vet- if it helps (& I've not seen any harm, it's safe when dosed for the weight of a snake) & boosts her appetite, that's the ballgame.
Try a bit of sunshine too- seen that work too.
And who cares what a chart says? Every snake is different- even one disadvantaged with a slow start can do just fine with the right care. As I said, wild snakes typically grow much slower than our pets with room service.