sleeping in crib

Melissa
How do I get my baby to sleep in crib? She's been used to sleeping in rock n play. She's getting big now. She's 3 months old. She'll take lil naps in crib but at night time she wants out. She also hates sleeping in pack n play. She'll sleep great on my chest, in my arms or on my lap. 
How do I get her to sleep all night in her crib? Any advice?