CIO mamas... did anyone's kiddo regress?

HawaiiBrideGrm

So, DD has been STTN since 3 weeks old, literally. Yeah, we were lucky. Once DH switched her to a toddler bed for 3 weeks, then into a twin bed, then changed her room, then back into the toddler bed, and now back into the twin, she stopped STTN. I totally don't blame her b/c of the ridiculous number of changes (due to repairs on our home). Anyhow, I just want to turn back the clocks and put her back into her crib and basically not try to fix what wasn't broken. Obviously, we are screwed. I tried CIO for 3 nights but it killed me to hear her, "Mommy, open the door?" like 25 times a night. So I gave in. Now we lay with her for like 15-20 min until she falls asleep and then leave the room, and she sleeps until 6am when our alarm clocks go off. She never woke up d/t our alarms before. Soooo frustrated!!! Any advice? Thanks.