Crib sleeping... Need advice!

My LO will be 4mo next week and HATES her crib. I've been trying to get her to sleep in it at night (she normally sleeps in her rock and play) and she will sleep for 2-3hrs in it max and wake up screaming and crying. She hardly naps in there. She will be sound asleep and the minute I lay her down she wakes up. She will literally sleep anywhere but her crib. She will be starting daycare in August so I'm trying to get her used to sleeping in a crib/falling asleep on her own. Any advice or suggestions??