Nature I'd take her if I were you too. Hopefully it's just MMR side effects.
Despite her not going to bed very easily last night, S woke once at 1am and had water in a bottle then woke up again at 3 but I left her for 5 minutes and she went back to sleep.
I need to try and stop the one wake-up she now has (it's always at around 12/1-ish) but I don't know how!