Hi there ladies,
yes this might be a time for a developmental leap. For some it comes sooner, for some it's perfect 6mo.
It sounds to me like she is UT, she might need more time to play in the morning.
Is there a reason the first A time is 3h, the second is 2h 20 min and the last one 4,5h? I feel like if you try to spread it out more evenly the situation might improve.
You wanna try?
I would start with giving her more time to play in the morning, so put her down a little later. What do you think, can she do a nap at 10:20 ?