Won’t nap in crib

My daughter is almost 6 months and has to be rocked to sleep for her nap. As soon as I get her to sleep if I put her down she always wakes and never settles. I usually will wait a couple minutes to see if she will settle but she usually doesn’t...as soon as she’s in my arms she passes out instantly also in a swing as well... hellppp I want her to nap in her crib