need help asap

my daughters started waking up at stupid o’clock in the morning between 1-4 and having a massive meltdown when we tell her to go back to bed. she’s then waking up again between 5-6 and refuses to go back to bed we’ve tried everything but she just screams her head off and bangs her bed against the wall. she’s started waking her baby brother up aswell with her behaviour. we live in a block of flats so have people with kids under us and people with kids to the side of us and ik she’s waking them up to and i feel horrible. we’ve tried everything we can think of but the only way she’ll calm down is when she’s outta her room. we even tried letting her sleep with us but she doesn’t go back to sleep she just does everything she can to wake her brother up. between the late nights with my son and the early mornings with my daughter i’m getting about 2-3 hours of uninterrupted sleep and i can’t do it anymore. video to show what’s she’s like and it’s all the time every day