Hmm yes I had one like that!
Ok, so here's what we did at this stage, I warn you it wasn't pretty for quite a while though.....
WU whenever, not out of room until 6.30am but would let her sleep in if she could
Nap set at 11.30am, 15 mins early if EW, uncapped
BT set at 6pm (up to 30 mins early if short nap)
If we hit a day where there was a pre-6am waking then I would go for a drive at around 9am and drive for 30 mins or so. She would usually fall asleep and I would let her have 20-25 mins then pd for a pm nap around 12.30/1ish. This was a girl who would never sleep in the car previously but the 2-1 made her so tired it did work occasionally.
I do think however it would be worth trying your pm nap EARLIER than currently. She is doing effectively 9-9.5h A time with only a 30 min nap so I think she is most likely OT already when you put her down for the pm nap which is why she can only manage an hour's sleep. I would try a nap at 12.30/1pm (she shouldn't need a full A time after a 30 mins nap, especially with 4.5-5h A beforehand.