toilet paper and perceptiveness

This morning, Bell was sitting on the potty and I was sitting near her. I needed a tissue to blow my nose, so I just grabbed a little bit of toilet paper. As I was blowing my nose, Bell said, "no mommy, that for your bottom, not your face. no mommy".
:)
After I threw the toilet paper away, my eyes must have been a little watery and Bell looked at me very intently and then asked, "mommy miss daddy?"
she thought i was crying, or at least sad.
i suppose that most of the time, when she sees me feeling sad, that's the reason.

she is so sweet