She has been working for us for 2 years.
She's had some upset in her personal life in the last few months which she has kept close to her chest as is her right of course.
On 3 or 4 occasions now I have noticed that the tumble dryer is still warm when I come in, there had been none of our laundry to be done and the fluff filter was thickly coated in fluff including what I can only assume is dog hair (we have no pets, she has a dog and a cat). I empty the fluff filter after each use so have a fair idea what is usually in there.
Now, if she has a problem getting stuff done at home, I'd be happy for her to use our appliances (we are trying to reduce electricity bills and I only use the tumble dryer for a few minutes to fluff things up and then hang everything on our ceiling pulley thing, but hey ho, if she is stuck I'd be happy to help).
It's the fact she's not asked that does not sit right with me
.
And I don't know how to approach this: "According to our fluff filter you have had unauthorised use of the dryer"?? 
Any words of advice?