What did you do in the end?
My vote would be to go with A times, but that's because my two have always done well with A times and I've seen several people who pushed to one nap early and then ended up wishing they'd stayed with 2. So, 4hr A, 1.5-2hr nap, 4hr A, CN to get to bed, 2.5-3hr A (depending on CN length), and BT. However, I've also known people who have pushed to 4.5hr with a long nap at 11-12mo and everything has gone totally fine, so it really depends on the baby. She seems to handle the long A's just fine when you push her in the morning, so it might be worth a try. You can always go back to 2 naps here and there when needed.