Baby waking up earlier

My daughter has been a really good sleeper she has always slept 10-12 hours a night without waking since she was 3 months old no problem. She’s now 6 months old and she’s only been sleeping 6 hours a night for the past 3 nights. She wakes up at 4am and I feed her hoping she will go back to sleep but she wakes up and wants to play? I am grateful that I at least get that 6 hours of sleep but it’s not usual for her. She has her two front teeth that already cut through at 4 months old, and she didn’t even have any problems sleeping 10 hours when she was teething with those. Now for the last couple of nights she’s up at 4am. she doesn’t wake up fussy or anything so idk. I’m looking for maybe suggestions on how to break this 4am cycle. Before saying “oh my baby wakes every 3 hours it’s normal for that age” well it’s not normal for MY baby so please scroll along because she has ALWAYS been a good sleeper. Thank you.