Sounds like OT hun, esp with all the WU's before 11.30pm & the restlessness in the early morning. Glad she actually did go back to sleep & lie in til 8am though - nice! Perhaps log a few more days of her EASY & then post them all for us to see, if you feel things are still 'off'. These little tinkers do like to throw us by changing their routine/sleep needs every so often!
I know with my DS when he was around that age he started waking early & I was convinced he must need his nap capping shorter than 2hrs, but with hindsight, I didn't need to do it. All I needed to do was push his nap later. So we went from doing 5hrs AM / 2hr nap / 5.5hrs PM to 5.5hr AM / 2hr nap / 5hr PM. Then at around 18 months same thing happened & I started capping again but he got very OT & it turned out I hadn't needed to, all he needed was a longer morning again, so we went to 6hr AM / 2hr nap / 5hr PM. I only had to start capping at around 20 months (just to 1h 45) & I wouldn't say he is high sleep needs, in fact he's on the lower side of average. In fact in the last couple of weeks I've been capping his nap to 1h 15 & we're all overtired again so I'm back to the longer nap. He is soooo much happier with it, & I think I just have to accept we're not going to get 11-12hr nights now until he's ready to manage the days without his nap.
Of course, your DD may well be low sleep needs & only need a short nap in order to sleep well at night, some LO's are like this (KayDee's DD is testament to this!), but many need that longer nap in order to sustain them through the day. I found it out the hard way.
HTH.x