I am really hoping this was a one off REALLY I am

Today I went to the toilet (as you do) and when I came out DD2's bedroom door was shut and I smelled smoke I looked in the kitchen thinking I may have left something on, before opening DD2's door to find DD1 crouched on the floor with a candle and the stove lighter

I yelled, but she smiled and giggled at me

I don't even want to think of the "what if's"

I tried to explain to her about fire (which we have done before) but she just kept smiling at me

Soooo I need help, WTF do I do????

I just took her out the back and set a stuffed toy and a shirt on fire to show her what fire does, I am now scared about encouraging her.

Please help!!!