I run my own very small business and I have one employee. She is sort of an all around assistant. Because it's just the two of us, it's a fairly informal work environment. She earns a salary. She has freedom to come in late or step out in the middle of the day or take a day off if she has something personal to tend to so long as work gets done. And if we're very busy, she will stay late or do some work from home as needed. I don't know that I would say we are friends but we are certainly friendly and I have invited her socially on a couple of occasions. Anyway, I think she has gotten a little too comfortable/familiar as if we are business partners rather than her being my employee. I need to put the kibosh on it but I don't want to tarnish our working relationship (and she's particularly sensitive to criticism). Thoughts?