hi again
I think she might be ready for some more A time. By your current routine it looks like she has usually 2 hours A time between 2hr naps. The shortening of her naps to 1.5 hrs is completely normal at this age, and means she needs less daytime sleep and more A time- she is growing up!
at 6 months our routine looked something like this:
7am wake
9.15am nap 1.5 hrs
10.45am wake
1.15pm nap 1.5 hrs
2.45pm wake
5pm nap 30 mins
7pm bed & sleep
I know it's not that much different from yours but you'd be amazed how much difference an extra 15 mins can make at this age! I would suggest extending her A times slightly, say perhaps 15 mins but watch her to make sure she doesn't get overtired.
Also you could implement a wind down routine, so she learns when it's nap time and gets herself ready to go off to sleep more easily. This could involve things like sitting and having a story for 10 mins, or having some lullabies in he darkened room, or even just a stroll around the garden. Something quiet with little physical activity. And do it before each and every nap so she learns what it means. I started to do this with dd when she was about this age and wih I had done it sooner as it made it much easier for her to go to sleep.
hope this helps