ETA - Bookwormmom, so glad to hear your news... and to know that you're finally getting some SLEEP!! :)
Original:
Swaddle her. She's not used to all the space.
You really need to get her used to falling asleep in the crib and not in your arms. Lay her down after feeding her, swaddle her and then pat her. Don't hold her. Yes, she's going to cry because crying is what gets her what she wants. You have to train her now. As she realizes that all she is going to get is you patting her, the crying will finally subside and she'll sleep. Don't wait until she is exhausted to put her down, though. Also try to keep her on a sleep schedule rather than just here and there. Watch her for signs of sleepiness - rubbing eyes, yawning, etc.
You really have to understand that crying is part of it. It's not your job to prevent her from crying. It's your job to meet her needs. She needs to sleep. She needs to learn to self-soothe rather than you hold her all the time. She needs to get used to her crib.
Don't pick her up - just pat her. It may take a week or even two, M.. Swaddle her and DON'T pick her up. She will get used to this after she gets used to you not holding her anymore when it's time for her to sleep.