Is there a service that will give us a week off?

We moved my Mother, with Alzheimer's, in with us 7 yrs ago. Once in a great while, we can get someone to watch her when we go out for an evening. Most of the time she is pleasant, but sometimes she makes a Missouri Mule look like a kitten. If she wants to do something, regardless of how small or large, she is going to do it, safe or not, no matter how many times we try and suede her. We are our wits end at times and would like to take a week vacation, by ourselves. Is there a service or facility we can leave her for a week or so and feel comfortable doing so knowing she will be safe and cared for? Are we bad for wanting her to appreciate the care she is getting since my brother doesn't want to be bothered?