Ideas/tips to get through this sleep thing that everyone seems to be experiencing?

The thing is, most of the time, she’s not crying. She’s just not going to sleep. If she falls asleep on her own (miraculously), she’ll wake up in an hour or so crying, and we may be able to get her back to also, but usually not. And we’re just bringing her to sleep with us at that point, because we usually go to sleep then, and to make it clear that we’re all sleeping. But when she won’t even go to sleep? And is just babbling? What am I supposed to do, when if I pick her up to rock her and put her back down, she starts crying and won’t stop?

Honestly, I just need tips. Because at this point she’s coming downstairs with us until we go to sleep.