15 month old not going back to sleep 😖

Ever since daylight savings my daughter wakes up at 2am and won’t go back to sleep until 4-5am then is up at for the day at 7:30am. She isn’t teething right now so I literally have no idea why she keeps doing this. I’m 35 weeks pregnant sooooo I already can’t sleep as is so this can be a little frustrating 🥲 any advice or atleast anyone else going through this so I know I’m not alone.