Well it seems as though we hit a downward spiral into an UT/OT loop.
My husband had E on Thurs and Fri (he was off work for our holiday). On Thurs, he let her nap until 430 and that night she didn't fall asleep until 10. I talked to him about not letting her sleep so late but he still let her nap 130-4 on Fri and he said she didn't fall asleep until after 10. She had 2 NW those nights, which is abnormal for her, than was up at her usual time 6/630. Sat was messed up because of a gathering at my in-laws. She only napped for 45min before we left, was acting tired the whole time we were there, then didn't get her to bed until 8. She was crying almost immediately after PD (unusual for her) then I rocked her to sleep by 830.
On Sun, I'm not sure when she woke but she napped 1-315. We PD at 715 because we thought she was OT but she didn't fall asleep until 915. She had 2 NW, one which was early.
I mentioned before that BT's later than 7/730 just don't work for her so I'm thinking she needs to be up no later than 2/230 to make that happen. The only problem is now she is OT and so unsettled at night.