Gamer, bartering is no longer a common practice. I suspect you would bitch and moan if your company decided for you what products you will use, what clothes you should wear, what food you will eat and then dropped your salary because of these so called "benefits". If the combination of your actual payment and bartering equates to R200/day, then why not just pay her R200/day in cash instead. You're not out of pocket any more than you were before because she will no longer be using your goods/facilities and I'm pretty sure she'd be a lot happier.
BTW, you forgot to mention the increased electricity and water costs she causes you...
BTW, you forgot to mention the increased electricity and water costs she causes you...