If you put it in the beak and push it back a little, she'll swallow it. I do it all the time. They can swallow a frog, lizard, mouse whole, a pill isn't a problem. If you mix it in water it will settle out. If you absolutely have to, you can grind it up and mix it into a small amount of moistened feed (so the vitamin sticks to the feed), but you need to make sure she eats it all. It's much easier to just pop the pill in so she swallows it.