Hi there, same as Sara here. 11 or 11.5 for us and we bring out the band. With her nights and naps combined, she might be on the lower end but some LO's are and if they are happy it's not really a concern. 11 hours is really good for her age and still taking decent naps...awesome :-)
If you are worried you can log her sleep in a 24 hour period over several days and just check the average. The book indicates 15 - 18 hours until 18 months but in reality it's more like 14 - 16 around 6 months and even my paed says 14 is really good when a LO is a happy baby. If she was cranky and fussy all day (unrelated to development or teething), you might need to revisit the issue.
It's a good idea to leave her in the crib in the morning until her day starts, let her have some independent alone time. If she starts to get the idea that she can get out a bit earlier and socialize, she might start creeping that wake up even earlier.
RE: the CN - it may be that she needs a bit more A time between naps to give you a better second nap which can take her to bedtime without OT. 45 mins for some LO's is UT and it sounds like she's capable of longer naps on her own. One option is to limit her AM nap to 1.5 hours and see what happens. Or increase the A time a bit after a good 1.5 or 2 hour nap and see if she can give you another 1.5 hours nap in the afternoon. If you don't drop the CN when she's ready you might start to get EW.