She asked them where they put her food, and they just shrugged and said they ate it, and fed the pet food to their pets. No real need, it was just convenient.
Sue
This is the major issue with preparing outside the realm of your control. No matter how well you know a person or how related they are to you it comes down to the simple fact if its not on your property consider it 100% Gone.
They will use w.e tools or items you store and eat w.e food you store. I find when you ask someone to store something of yours at their house they will, after awhile, consider it theirs and free for the taking/using.