Roommate

There's a woman renting a room in the house and I pay for the groceries and she cooks the food for herself and I purchased some food left it on the table and she took the whole container! I was like she can grab one but the whole container what is wrong with her. on the top shelf of the pantry there's a shelf of multivitamins and medicines and she took them to her bedroom and I cook she takes the food to the basement and then brings it back up She doesn't clean or do anything it's the food thing that concerns me because I had cooked chicken for the house she grabbed the plate took it to the basement and she does this with all the food then brings it back to the kitchen with salads anything and I hate it or she cooks is done at lunch time hides the food in her room and then around dinner she brings it up do you want to eat it's like is she doing something to the food if I buy muffins, cupcakes, cookies anything set it on the table she takes the whole thing to her bedroom it's creepy it's like she's taking advantage of the groceries and food in the house what type of conversation would you have? I told her if she cooks not to hide the food in her room to just leave it on the kitchen stove what conversation could I explain this

Edit there's people who practice religion there's many different types of religion voodoo, santeria, Wicca, paganism, and there's some people who practice witchcraft and put it in food and the recipes.