Early wakings

I'm not sure what to do anymore. I have tried everythiiiing. My almost 8 month old has been waking up between 4am to 6 am. It has been going on for the last month now and i think i have just been hoping the issue would fix itself since i have tried everything! This week she has been waking up around 5 am. Today 4am because we tried a later bed time of 7pm and i thought i would try to stretch her wake times from 3 hours to 3.5 hours.

I have tried giving her 4oz of milk to get her back to sleep, later bed time of 7pm but then i deal with 4am wake ups (like this morning), changing her diaper. I dont want to have to keep going in there and give her the wrong impression that it is wake up time. But if i dont go back into her room to put her paci in, I feel like she is more awake because she will babble or do her happy screams.

Her usual bed time is 6pm. She gets in 12 to 14 hours of sleep a day. I have her down to 2 naps a day where she will sleep about an hour to 2 hours per nap. Wake times were 3 hours but now I'm trying to stretch to 3.5 hours in hopes this might fix her early wakings. If i try a later bed time, she wakes up even earlier i feel.

I don't know what to do anymore... I am at a loss.... Is it normal to have a baby wake up this early? Is this a result of me having to wake up this early when i used to work? This morning I am going to try and not go into her room until after 6am...

Please help!!! I need sleep!!