What’s happening??

We transitioned our 5 month old into her crib 5 days ago. 1st night we had a bumpy start, 2nd night I only had to attend to her once, 3rd night she was up and down from 9pm-1am. 4th night she was up and down from 4 am-6 am. Tonight’s the 5th night and she’s been up and down since 8:00 pm. Are we hitting a sleep regression late? We never got one at 4 months? Is she going through a leap? We were doing so good.