All I am going to say is that I have been there. Man, have I been there. Napping was a dream for Izzy (no pun intended) until she was about four months old and then it was all over. She would scream for an hour, scream while I was rocking her, I would try to nurse and she wasn't interested, etc, just scream and scream until she wore herself out. I've been there. We didn't get stuff figured out until she was about seven months old. But, the good news is that I figured it out, we have a routine (SOOOO critical) and now she is a champion sleeper. Seriously, if there was a compition, she would win. So there's hope! Unfortunately, I can't give you anything concrete because I'm not sure what I did. I know that reading The Secrets of the Baby Whisperer helped a lot- it's kind of like cry it out without the crying, if that makes any sense. But the key thing to remember is that there is no one way. You have to keep trying, and if after three or four days it doesn't work, try something else.
That said, I have to say it would be in your best interest, long term, NOT to rock or nurse her to sleep. I got her into the habit of nursing to sleep at one point, and she started needing it EVERY time she woke up at night (which became every hour or so). It was a REALLY hard habit for me to break, and I'm hardcore when it comes to breaking habits. And, it sounds silly, but falling asleep on one's own is something babies have to learn to do. And now that mine can, it's soooo great. I just lay her down, kiss her, and that's it.
Anyway, good luck, stay stong!