Do you ever try to resettle in the mornings? Not sure if you've had success with that. What time do you get her up and out of bed?
To be honest this is where I'd just stick to a plan, any plan, whatever you are comfortable with, but stick to it regardless of night length, WU etc. You can borrow ours if you want to

WU whenever but not out of room until 6.30am earliest, try to resettle any EWs, quiet time around lunchtime, short CN around 3/3.30pm if struggling, BT 6.30pm. Expect to get some grumpy behaviour and some NWs for a while though......doing this we got an average of just over 12h sleep in 24h. My guess would be if you try if for a week or so and you're getting significantly less sleep than that, then she's not totally ready for all NNDs yet (given historically she's needed more sleep than J).
What do you think? Maybe you could even try BT earlier if she needs more than the 12h?