Sorry, but just a little confused because according to your schedule dd wakes at 6 am and goes to bed at 8pm.
At any rate, quite honestly I think you are doing great! I really consider a short nap to be 45 minutes or less. Since dd tends to take a couple of 1 hour naps, but has and can take a longer nap, we know she has the ability to sleep longer. And since she sleeps very well at night, I think there isn't a whole lot to worry about. At 6 months of age she should be getting 11-12 hours at night and 2.5-3 hours on average during the day. So she is fitting in quite nicely.
She is still taking a 3rd nap, but many babies don't drop the 3rd nap until apx. 7 to even 9 months of age, so again, I think that is fine. You may see her start to resist the 3rd nap. If that is the case, then you will definitely want to look at readjusting the day so that you stretch out her A time and her 2nd nap of the day happens later than 11 am (closer to 1pm). Until then though, I really wouldn't worry too much.
HTH?