3 month sleep regression?

My 3 month old daughter used to go to bed around 7:30pm and wake up at 4am for her night feed and then go back down until about 7am. Now when we put her down at 7:30pm she treats it like a nap and will wake up at like 9pm. Currently still awake and has no signs of being tired any time soon lol. Is she going through her 4 month sleep regression early? Her sleeping pattern changed out of nowhere.