Earlier Bed Time and Fussy in the Evenings

So starting about 3 days ago, Jemma started getting extremely fussy in the evenings and so we had no idea what was wrong other than that she was tired. So we started putting her to bed earlier. So for the last 3 nights in a row she has gone to bed around 7:30pm and slept 11-12 hours straight! She is also taking earlier naps and sometimes shorter as well (1.5 - 2 hours) and anywhere from 11-12:30. She is definitely down to 1 nap a day now.