What does the narrator's fascination with matches lead her to do?

From the text:

One day I found a half full box of matches. I was thrilled, because I much preferred the wooden matches that came in boxes over the flimsy ones in the cardboard books. I took them upstairs and locked myself in the bathroom. I pulled off some toilet paper, lit it, and when it started burning, I threw it down the toilet. I was torturing the fire, giving it life, and snuffing it out. Then I got a better idea. I made a pile of toilet paper in the toilet, lit it, and when it started burning, the flame shooting silently up out of the bowl, I flushed it down the toilet.