M.,
Keep a journal of her feedings, how much and at what time, sleep and wake patterns, any unusual or illness symptoms. You will start to see patterns emerge.
One thing is I notice you said is, when you laid her down she woke. You don't want to get her used to sleeping in your arms, and then try to lay her down. You want to lay her down when it is nap time, she is awake, and she should be tired. You need your care provider doing the same. Let her get used to the routine, if that's the routine you desire. Babies will get used to being cajoled, walked, and hugged to sleep, and as they start getting older the sleep "problems" will start arising.
That's fine to hold a baby through sleep in cultures where they strap the baby on their back all day and night and go about thier business. If you are not prepared to do that you should start training her to sleep on her own now.
It might be possible she may need an extra bit of feeding before she goes down again in that second nap in the morning-
If she goes to bed at 6:30 pm and wakes at 6am that is a long stretch without feeding. So it is possible that you need an extra feeding before the second morning nap. I have done that at times with my babies. I would think at her age, she should be tired enough to be down again by 10 or 10:30am. In fact, after she wakes and the feeding is given, the next cry to come out of her mouth will be either be for sleep, or a bit more food and then some sleep.
Have you started solids yet? If you have, it could be possible that is an issue? I would be careful starting solids before 6 months.