Hi there!
I read a few of your posts and I hope you don't mind I am joining in with me thoughts
.
It seems to me like you are relying too much on her sleepy cues (which are not reliable at this age anymore with most babies) and jumping around A times too much trying to figure out the right one. That's fair enough
but if you give one A 3h, then the next day you jump to 3.5h, then the next day to 2.5h 'cause none gave you good naps - you will not see a pattern and you are actually confusing your LO like that. You need to give her a chance to set her body clock.
She is around 8m, right? So to do that I would have all her A time at 3h, which is the lowest at her age. I would do it like this:
7WU
10-11:30 nap (can also be 2h)
11:30-14:30 A
14:30-16 nap (can also be 2h)
18:30-19 BT
The 2.5h A time before BT seemed to work well for you then I'd try and stick with that if possible.
If she will not nap for 1.5h for her nap I would try and stretch it by whatever works for you now (either ST or props). Personally I think that she is too old for Shush-pat and most babies this age find Shush-pat stimulating, but if it works for you then continue with that. If not then I would use PU/PD.
You try and settle back to sleep for 40min and if it doesn't work then you take her out of the room and start your A time, probably shorter than 3h 'cause she didn't sleep enough.
You do that for 4-5 days and then if you still get short naps you gradually start increasing her A time - first to 3:10h, then after 4-5 days you go up to 3:20h and so on. You stop increasing A times when on the 4th-5th day you start to get restorative naps - 1.5-2h long.
That's the only way I can think of that you can find out her right A times. I know that it's like starting from scratch but it's methodical, yk? You give her enough time to get used to each A time during those 4-5 days, preventing her from getting OT and then moving on.
What do you think?