I had to lay Danny on his belly. The ped said it was a no no but I figured they change it every few years so I will just look forward to the next change back to belly.

It will take some CIO to get her to lay if she is used to being held from what we have tried. I had Ex-DH do the transition with Danny. He cried for 45 minutes the first time, 20 minutes the next night, and after that he would talk himself to sleep. The younger you do it the better, but you can try a swing, a bouncer, a sleep sack with something strapped around it to make it snug ( obviously something baby safe). Danny was 8 months old and after trying everything I could think of over a 5 month period we just did the CIO. I would sit him in a bouncer where he could see me and he would cry, I would talk to him, sing to him, everything...he would calm down but wouldn't sleep.
That is probably basically no help but I hope it maybe gives you some ideas. I will ask my Doula/Nanny friend and see if she has any tips.