Our baby budgie(14 weeks) does this, our previous baby(16 weeks) did it too.
They both used/still does it, sit in the food, kicks seeds out, digs his head around in the seed and it goes everywhere!
Ours just started doing it less and less, every time he did it, we would get up, get him to perch out finger, and put him on the side of the bowl instead, or just move our finger close and he would jump out and chirp.
I guess you can hope that she grows out of it. Other than that try and 'discourage' it or show her that it's better to sit on the side, not inside.