I would agree with PP, it seems that if she’s waking happy then her sleep needs are being met. With my DS1, with a 7pm BT he never slept past 6am whilst he still needed 2 naps per day. When he dropped to 1 nap, he slept in until 6:15/30. I considered pushing his BT back, to push the WU but decided, for me and OH, that having that extra time in the evening was more important than the morning.