Naturally I got cross & she just had a meltdown, crying & yelling that it was crayon ( which she of course couldn't find). Then she tried telling me she did it yesterday, all the time still denying it was nail varnish. I had already told her off for having the stuff in her room & the smell was overpowering. During the tantrum, she accused me of lying ( not sure where that came from). We have been having very challenging behaviour for quite some time now. Not sure what to do as she gets her tablet taken off her for a lot less. Can you just use nail varnish remover on carpet?