I have a 2 year old and a 3 year old and work 4 long days a week. Have been massively struggling to keep on top of the housework and so 6 weeks ago, I hired a cleaner to do 2 hours per week for £10 ph. Unfortunately I think she is stealing from us 
About a month ago, a bottle of non bio washing liquid went missing. I thought at first that I had mislaid it, or that I was going mad, so didn't think anything more of it. However, she came yesterday and another bottle has gone. She doesn't do any washing for us so would have no legitimate reason to take it. I think some toilet rolls have gone too.
It's not high value stuff but obviously I don't want someone in the house who is taking things we have paid for. So what should I do? I need to get my keys back ASAP, but how should I ask her?