If it's just the fine granular coco husk stuff, you might first try dipping her mouth to encourage drinking...that might do it, & its a lot more stress to forcefully
open a snake's mouth, especially since you'll risk a regurge right after a meal if there's too much "handling"...but whatever works, good luck. It won't hurt if
she swallows this stuff, but leaving it stuck in her mouth/teeth can set up an infection.