Haha, most if not all hamsters do this. They will come out foraging and then store a lot of food in their pouches (it's actually quite impressive how much) then make 'stores' in their cages of the food. It's just natural to them even though they don't 'have' to, and it's part of what some rodents do.
She'll put it in a store near her bed probably so she doesn't have to go over to the food bowl when she wants something to eat..
Hope this helps, feel free to ask any more questions you have xx