Help! Another sleep question... 😕

We sleep trained my 5 month old baby using the Sleep Sense program two weeks ago. She was doing AMAZING after the first week. Taking amazing naps, going down with little to no fussing, no more pacifier walks of shame in the middle of the night. Could not have been happier.

The last three nights after going down for bedtime, she has been waking up about 45 minutes later screaming. She gets so worked up, so I go in to calm her down. Pick her up, snuggle, etc. but as soon as she's back in the crib, she starts crying and gets hysterical again. The last two nights I've been giving her the pacifier because it's the only thing that calms her down, but I really don't want to go back to her sleeping with a paci since she relies on me (multiple times a night) to replace it.

I'm so confused and can't figure out what's going wrong. I don't think it's a timing issue... She's tired, but not overtired when she goes down.

Any ideas? Suggestions? Commiseration?