Stopping by as I saw the message on your old thread. You've already had great advice, mainly don't try to get a long second nap, don't let her be UT for BT and BT may need to move later for a short while.
Based on how your DD has slept in the past I would use option 2 on that link (go and have another read I think you'll see you were successful before in increasing the first A time and letting that be a decent nap and then working from there for the rest of the day - let me know what you think).
So I would increase first A to a point you get a really good first nap, reduce second A (it can be very short, just don't fight her to bed, she needs to be tired enough to agree to the nap), do CN (hurrah you no long need to worry about trying to get this longer!), then a decent A to BT so that she doesn't fight you. maybe later BT for a while then EBT when the CN drops.
There is no set routine to follow but your day might look something like this
WU 7.30
A 4hr
S 11.30 - 1.00 (1.5hr or longer)
A 3hr (could be shorter if she agrees to it)
S 4.00 - 4.45 (30 to 45 min CN) (30 mins gives longer A time to bed but she might get the grouch)
A 3hr (may need to be longer if you get BT resistance)
BT 7.30/7.45 (only move later if needed)
FWIW we also went cold turkey in the end because mine could not have a capped CN. Some will do a short nap and be happy some won't (mine). But we got to 12 months before totally moving to one nap. Pretty horrendous nap drop for us as it turned out but we got through it
And you will too, no matter how it turns out. You can probably find a steady to keep you going for another few months yet.
Once you hit a 5hr+ first A time you can drop the CN and do early BT instead.
WU 7.30
A 5hr
S 12.30 - 2.30
A 4hr or less
EBT 6.30 or earlier, even 5.30
if you get super long nights (13 -14 hrs) they are unlikely to last for very long and you'll know to move BT a bit later again.
Hope this helps
