It’s 3 am why won’t she sleep!!!!!

Does she drink breast milk or bottle fed ?

Look up advice from a sleep training professional and ask your pediatrician

That's normal. Newborns take time to adapt to our circadian rhythm, in other words they don't distinguish day and night like we do. Until later on they in their development they it's expected for a newborn to only sleep two to three hours at a time. But yeah, Raven is right. Consult with a board certified specialist. Your gp might be able to guide you or look private but be careful with Internet trained "specialists".