Your child is learning about a new environment and the provider is learning about a new child. You need to be sharing with your provider about how her routine goes at home, and ask about their routine. Let the provider know any special things you do to help your child relax. Those may not work the same for someone else and they may need to experiment to find what works best for them, but it still helps to know what the parent does.
You have already gotten the advice that the stimulation of more people, things to do, etc. is part of the problem. Her age is also part of the key. Six months is usually when the teeth are getting ready to start bothering her, she is getting more alert and active in general, and is more stimulated by her environment. All those things take some time for a child to make adjustments.
I see that some have suggested putting her to bed earlier. I don't think I'd want to make a huge adjustment in bedtime, though a little might help. It just doesn't make sense to me for a parent to have the child in daycare all day, then when you get home put them down to sleep so early that you don't have much time with the child yourself.
One person obviously is a firm believer in being a stay at home mom. I don't disagree, and at one time would have been probably quite obnoxious with making that suggestion quite adamantly myself. I realize now that just doesn't work for everyone for various reasons, but do suggest that you might want to take a look and see if that is something that will work for you and your family. Sometimes I think people look just at a financial situation and think they need more money, when there are actually other options that could help them work out the finances of the household. In our family, for instance, it was generally agreed by my husband and me that I was to be a stay at home mom. So we made sure our 'needs' were minimal. We lived in an older and smaller house, had only one car most of the time, planted a garden, shopped thrift stores, and avoided the higher priced name brands as much as possible, found free or inexpensive entertainment... you get the picture. Our grown children look back with fondness on those days and do not feel that they were neglected in the least. Now my husband and I live in a larger, nicer house, and are more able to purchase the nicer things, but choose to keep a simple lifestyle because we're happier with it. Only you know if your lifestyle can use some simplifying, so just take this as a suggestion, and do with it whatever seems right.
Whatever your decision, I don't think you need to stress over your daughter's nap schedule. It should even out in a week or two and she'll be just fine.