You need to be in control. When you hire friends, the nature of the relationship will get blurred. Do not assume the she will do it every time you hang out together. Well Attendants are people too. If you treat them well and give them respect, they will be much more willing to work for you.
Nobody likes to work for a dictator.
A little flexibility and understanding can go a long way. The relationship that you develop with your attendants is inherently intimate. Problems always arise when people are so close. An adequate amount of communication can solve the problems. If you don't, your anger will grow unless the issue is resolved.