I am EXHAUSTED. Night waking advice needed.

Ok so I’m on baby number 3 and holy hell this kids sleep is horrendous. My others kids were pretty well sleep trained by 5 months and only woke up maybe once at night. This baby??? Fuck no. She usually wakes up around midnight, and then after that it’s constant like every fucking hour, and then after 3am it’s every 15-30 minutes!!! I’m so exhausted and frustrated!! I’ve tried all sorts of sleep training, I’ve tried to help teach her to self soothe, I’ll fed her, I won’t pick her up, I’ll try and lull her back to sleep without waking her more but this kid just doesn’t get it. Day time naps she does amazing, we have a nap schedule and I can lay her down and she goes right to sleep so I don’t understand what the issue at night is! 😭 and she’s not waking up screaming but rather she will wake up at 3 am wide awake and PLAYING. I’ll go over and look and her eyes are wide open. I don’t understand and I need help because im so tired, my husband works out of town and is gone all week and I still have two other kids I have to care for during the day!! Help 😭