Help baby won't sleep

Since our baby got her leap and sick she won't sleep in her crib. That's over a month now. She's getting over her cold but every hour she cries and want the boob at night. If I ignore, it gets worse. She cries in her sleep but as soon as her eyes are open she's quiet and smiling. I don't understand what's going on and I'm getting no sleep. From 2-5 months she was sleeping in her crib sometimes the whole night or coming 1-2 but now it's 6-7 times!!!! Help