So if she sleeps till 1:45 like she did yesterday, the second nap would be at 5:45. Would that be too late for a nap?
For some it would be too late, for some it would be fine. I would think if she is generally refusing EBT than you generally need to try for the micro-nap of 10 mins or so. If this causes her to refuse BT at the regular time you can move BT a bit later however if it causes it to push BT to a silly-late time then I would drop the micro-nap. It's more about what happens over an extended period rather than each day. Hope that makes sense. In terms of how late BT can be moved, well for me personally I wouldn't go later than 8pm.
You might be able to do CN 5.45 - 6 and 8pm BT for example as it is only a 10-15 min nap, if she doesn't constantly refuse BT.
I hope this makes sense.
The other was when can I stop pushing the am nap later for a bit? I got it to 11:15. Today she slept later so o pushed it to 11:30 and she slept 1h20m. Can I keep it there for a bit as long as the morning wake up isn't too early?
Yes I'd stop there. Try to maintain a balance so that there is no nap refusal due to UT, so that the nap is long enough to be restorative (or the best you can get) and so that WU time doesn't start getting earlier. This way you can continue the little CN later on and maintain a reasonable BT.
As soon as there is consistency with EW or nap refusal then you'll probably need to go to one nap and at a slightly later time to balance the day.
I'm aware I am not being very clear with my thoughts at the moment, I have some pain bothering me which is making it harder to explain myself. Sorry about that. Hope this helps some though x