So...I tried laying her down for a nap yesterday with one arm out. It was actually pretty successful! She took one nap that was 45 min and one that was an hour. I pinned her free arm against me while I rocked her and then when I laid her down I held her arm against her side until she was really calm. Whoo hoo! We'll see if we can do it again today.
Thanks to whoever gave the link to the escape proof swaddle. That is amazing! I did the little receiving blanket trick with our summer infant swaddle blanket and she didn't escape! It seemed to make her really calm too.
Re: update on stressed out about swaddling