OMG Lilli, your DD is almost exactly the same as my DS.
He sleeps 2 times a day for about an hour, sometimes 40 mins sometimes longer. He goes to bed between 7-8pm and wakes at least once (often more) for a feed or he just needs a hand resettling.
I have tried everything in the book to extend his day sleeps. It is just that he has had enough after 40mins-1 hour and is ready to rock and roll. He isn't tired in the slightests so I think it futile to persist with getting him back to sleep when he is all smiles and wants to play.
About good day sleeps = good night sleeps it isn't the truth for us. On the odd occasion that DS has had two 1.5hour sleeps in the day the nights are even worse.
Sorry I couldn't be of any help, I just wanted to say I know exactly how you feel.
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