2.5 year old is a horrible sleeper now

My daughter has been through regressions but we’ve been able to manage and re sleep train and it’s fine. Lately though nothing has worked. We’ve tried cry it out but she’ll just scream forever. We’ve tried putting her in bed with us but then she lays awake and plays. We’ve tried taking her back to her bedroom but she runs out again screaming. I’m at a loss. She’s clearly going through separation anxiety and she’s been very clingy and whiny and tantrums like way more than before. I don’t know what else to do. Has anyone been through this? Had success with sleeping better? She does nap anywhere from 30 mins to 1 hour.