I used to get those after I had strep throat a lot. But it was on my tonsils. It was bacteria or something like that would build tiny white clumps in pockets. Doctors can treat that. Also when food gets trapped in tiny pockets it can turn white and stinky. It's best to keep a very clean mouth. Use a strong mouth wash, brush regularly, and she may need to have an infection looked at. What worried me is that there shouldn't be any cavities next to her uvula. Unless you mean on the tonsils? I know you made this post way back in 2006 but stuff like this can persist for decades. If you try working stuff like that out of the pockets with your tongue you can run the risk of moving your jaw out of place over time or over working a cheek muscle. Also it's dangerous to try to use long objects to poke at it to get it out. Best answer is to "See a doctor ASAP" if not already.