If you have an empty paper towel roll you can use that as your "hook". Let her hit it a few times, eventually she'll give and ball up, and then you change her water or spot clean as needed. She'll eventually learn that striking out doesn't make you go away,
and that you aren't going to hurt her.

Since she's a baby and you just got her I'd suggest waiting to really handle her until she's had a few more meals.
Another trick is to cover her head with something light, like a paper towel or washcloth, and then pick her up when she can't see your hand coming in.

Keep handling sessions short for now - a minute or two at most - and put her back when she's behaving politely. Don't make any sudden movements toward her face so she's not encouraged to snap at it.

Also watch your shadows when removing her from the enclosure, ball pythons don't have the best eyesight and if you're backlit that makes you look even more like a predator coming at her.