Burnt carpet with hair dryer?

I was drying my hair.. Put the hair dryer on the floor for a a few seconds to grab the hair brush, come come back and the patch of carpet as completely melted away! I lied to my mum saying it wasn't me, then confessed in the evening and explained what happened. She said it was fine and that she is going to claim on her insurance for a new carpet for her room. I don't know why but I dont want my siblings to know as I have done this before with an iron at my dad's (it was an accident) and I didn't like the tease from them. Obviously they will when they are doing the new carpet. I feel so bad and don't know what to do:( we don't own the house either.