Constant sleep battle

Uggghhhh whyyyyyyyy.... my little girl has never been a great sleeper but we have been working hard at it since day one. We finally got into a routine of 2 naps a day (about 1-1.5 hours each) and a solid 12+ hours of sleep at night. When she first turned 8 months she has some sleep problems where she would wake frequently in the night but then go back to sleep but then wake again off and on all night long for about a week... well now at 9.5 months we are taking short naps and crying for 30+minutes at bed time. Soooo frustrating 😩. She’s lucky she’s a cutie