Awww New Mum, it sounds like you're having a proper nightmare
I'm no expert, and I'm sure everyone will have their own opinions on this, but I think she is massively OT and it's possible that your presence in the room is interfering with her settling herself to sleep.
Thing is, I'm not really a believer in SA when our LOs are this age - do you really think that she is anxious that you will not come back if you leave the room? I know lots of other mums swear that this is the problem but I think the munchkins are very switched on at this age and very good at (for want of a better word) manipulating us. If she doesn't display any SA behaviour at any other time then could it be that she's finding getting to sleep difficult and stressful (because of the OT) so would rather interact with you instead?
It might be that adopting a WI/WO approach gives you the breathing space that you need too.
Don't forget, she's also catching up from a very difficult couple of days with no naps, but her naps are getting longer so possibly the EW and NW will start to settle too if you persist with the early bedtime. Just hang in there, it WILL get better
We seem to have finally found a pattern that we/he can cope with - I'm sticking to clock times rather than A times, which seems to have improved time taken to fall asleep at bedtime massively (30 mins rather than up to 2 hours!). So we're doing 11am lunch, 11:45ish down for nap and asleep within 5 mins (used to be average 20), then dinner at 4pm, bedtime ritual starts at 5pm, in bed by 5:30, usually asleep by 6. I'm doing this WHATEVER time he wakes up in the morning and it seems to be working (probably ruined it by saying that!). Wake up is still generally earlier than I would like, but we are getting some 12hr nights now when we were averaging 10.5 and had even gone as low as 9. The longer A times in the morning have meant a shorter A time in the afternoon and that seems to be what he needs. We've even had some longer naps (were averaging 1hr 15 too for a while, but have had a couple around 2 hours which is unheard of in this house!) with longer morning A times.
I really hope things settle down for you - looking back over my... 8 weeks (!) of observation of our LO, the really rubbish periods don't tend to last very long, you are probably heading for a couple of good days VERY soon.
Worst comes to the worst, plan yourself a night out and give yourself a break thinking about it.
Laura x