Not sure I should be concerned or that she's gearing up for a growth spurt (suspect the latter but just wanting to put my mind at rest).
Suddenly tired at night about half an hour earlier than normal and today she's had 1hr 45 mins sleep this morning (normally she'll have 30-45 mins on a morning) and she's now had a good hour's afternoon nap as well. While I'm enjoying the peace - starting to just wonder what's going on a bit... she has been teething fairly badly, and she's chunked out a bit which makes me think she's suddenly due to shoot up (she'd better flipping NOT - she's in 18-24 month clothes already!) but seriously - has she decided to skip the terrible 1s/2s/3s/4s etc and go straight to be a teenager?!