It's always best to try to get them down before OT but after that, only she can decide to sleep yk? But you can be with her reassuring her in whichever way works. With mine, at that age, I always ended up picking her back up, holding for a bit and putting back down because I felt I had to help get sleep. It took me a long time to understand that it was possible to comfort her in the crib with patting/stroking and now we only comfort with words. It did lead to some crying in the beginning as she was quite bewildered with the change in our method but she soon caught on. It's important to simply be consistent in your method