I hope it goes well! As to your question about A time before BT it depends on how long the pm nap was and what her awake time was for the day. If she's an average sleep needs baby,you're aiming for 14 hrs total sleep in 24 so you'd aim for 10 hrs awake time in the day. So, if you are still hoping to do the 45 min capped am nap and uncapped pm nap, and you had her sleeping at 10:00 today then the day might look like this:
WU 6:45
A 3 hr 15 min
S 10:00-10:45 (wake her up)
A 3 hr
S 1:45-? (uncapped, but hoping for 1.5-2 hrs). Let's just say it was 1.5 hr and she slept until 3:15
A 3 hr 45 min
BT 7:00
If she naps less than that in the pm she may need a shorter A time to BT in order to not be OT. It will take a bit for you to sort you what her A time needs are, though. She very well may need more A time in the am or pm in order for you to get a long pm nap. You have to stick to something for a few days before you know if it's working or not and if it doesn't work, you have to be patient as you try to figure it out. Things sound like they've been pretty all over the place for you and your DD so it isn't clear what her A time needs are and it's going to take some trial and error to figure that out. Does that make sense?
That way she'd have 10 hrs of total awake time in the day.