jeannie,
don't be pek chek when she put her hands into the cereal. she's trying to explore the food that she's eating.
sometimes C also do that, then i let her play with a little bit of it, telling her that that's the food that she's eating, what's inside, etc.
when she doesn't want the cereal, i will wait let her see us having the food. sometimes i also eat her cereal in front of her. telling her how yummy it is.. she may be able to take a few more mouths after that.