Night Waking

My daughter just turned 8 months and has only slept through the night 10 or so times. We have had a bedtime routine since she was 4 months so we have no issues putting her to bed. It's getting her to go back to sleep at 3am that is the problem. She wakes up around 3 every morning sometimes sucks down a 4oz bottle and then we try to put her back to bed but she just screams. My husband and I both take turns putting her down. I let her calm down and then put her back, he waits until she is asleep. Neither work. We've also been setting a timer for 8 minutes after each of us finishes our second attempt and she just walks around her crib. Any advice? Even just a not alone would help, I was in tears this morning.