Sleep, again...

Eliana's sleep has been horrible the last few days and today is the worst. She was up every hour from midnight until 5 at which point I gave her tylenol thinking maybe she was teething and she slept until 8 thankfully. Usually, she would then go down for a nap 1.5-2 hours later, but she fought it and fought it until 11:30 (3.5 hours after waking). Slept for an hour. This afternoon went down around 3:15 for 45 minutes. Now, she fell asleep at 6, much to my dismay. I am seriuosly considering waking her (it has been 45 minutes) because I don't want her down for the night yet and waking up at 4am...what should I do?