Mamas help!!

We started crib training a month n half ago and it was going really well now all a sudden my baby HATES her crib. She’s 7 1/2 months old, we have a strict bedtime and day time routine that we follow Every day.

But recently she’s waking up every hour screaming and crying, only wanting to be rocked back to sleep and held while she sleeps. We have a sound machine goinf at all times with her favorite ocean waves

She’s not teething or anything and we haven’t had any big changes to cause a sleep disturbance..

Any reasons or any ideas to help get her back to sleeping longer?? And staying asleep without any help?