At that age I always let DS sleep but he never was a good sleeper overnight so I took my sleep where I could get it lol. Given she has had a cold and growth spurt I reckon sleep should win out!

FWIW we have recently had similar issues with DS dropping his day sleep but occasionally having a very late one and/or wanting to go to bed really early (like 5pm) and it's always a dilemma to wake or let him sleep. I have generally let him sleep though.