hmmm. this is tricky, huh? here are a couple thoughts I had. Obviously you know you're LO best! Just kind of thinking out loud for you.
- do you think there's a chance she was actually UT at bedtime and because she didn't settle right away, she worked herself into an OT state? My DD has been known to do this... Just thinking that 4/4.5 hr A is on the lower end for Los on 1 nap, so anything below that is really low, kwim?
- i'm wondering more about these unsettled naps. Is this normal for her to need resettling? any chance of discomfort waking her? you also said you heard her during the night but she ss. Is this all normal OT behavior for her or could there be something else going on?
- was your routine before set times working pretty well? you might just want to go back to that routine until her OT has settled down, then gently nudge her into a set nap time if that's what you're really after.
HTH a bit. Sorry things have been loopy.