Yes, you can't really push that am nap out any more. Is she going back to sleep between 5:15 and 6 am? If she's not sleeping then that's a really long A! but she's giving you a good long nap.
She either naps for 1hr 20mins (which I think is under tired?)
I don't stress too much about naps of 1 hr 15 and longer. I suppose it may be a bit under tired but really I think you would just be pushing the A out by another 10 min. It's when the naps are under 35 min that I start to worry that it's not enough (unless it's a CN and you have a short A until BT).
If she's teething then this could be the cause of the EW. If any pain meds were given at BT, they likely have worn off. Further we tend to sleep lighter in the morning so discomfort and other "day time" noises (birds singing, more traffic, etc) will disturb sleep so she might be waking and then with all of the "morning cues", she's just up for the day. You could try giving her another dose of Nurofen and see if she will go back down. (Make sure you have good black outs and white noise on if possible).