My 5 month old baby girl will not fall asleep unless she is wrapped up in a blanket?

She was in the NICU for 2 weeks after she was born. They had her wrapped up every single minute of everyday that she was in there! She got used to sleeping wrapped up like a burrito. Now i cannot get her to fall asleep without being wrapped up! I have tried leaving her unwrapped for almost 2 hours at night and she will not fall asleep, but once i wrap her up she falls right to sleep. How can i get her to sleep without being wrapped?