If you didn't yet read Elizabeth Pantley's book "The No-Cry Sleep Solution for Babies" you should go get it now! She offers dozens of ways to get your baby to sleep without relying on nursing or pacifiers or any one thing. Since your baby is only 6 weeks old, it will be easy to help her become more flexible. The longer you wait, the harder it will be.

I got my baby to sleep by walking with her holding her against my shoulder. Another position that seemed to put her to sleep consistently was laying her head in my left arm and using my right arm to support her body from underneath - it's kind of hard to describe but she loved that position (she's too heavy for it now). My husband and I took turns putting her to sleep with the walking method so she didn't get used to just one of us and this worked really well for us. We changed it when she got a bit older - we would walk her for a bit and then put her in her crib while she was still awake but already very tired and she'd just fall asleep by herself. Later one, we could just put her in the crib and she'd fall asleep. She's a year old now and still nursing but I never really let her nurse to sleep. When she was finished a feed and just sort of sucking, I'd shift her position and get up and walk with her in order to "walk her to sleep."

I think you can nurse her to sleep sometimes as long as you try other methods too. The only one I don't recommend is the pacifier! We used this with our second son and then we spent two years waking up in the night to go find it for him when it fell out of his mouth! With out third child, we used "patting" the most - just lying him across our lap or in his crib and patting his back until he fell asleep. This method is good because even a babysitter can do it.

I agree that variety is best. My sister had to put her baby in the car and drive around every time she wanted him to fall asleep! I was determined to avoid that problem when my daughter was born. So I made sure that my husband put her to sleep several nights a week and I did it several nights and I'd have my nanny do it during the day and we each used our favorite methods but my son ended up being able to fall asleep with any of them.

The way to stop the baby from nursing to sleep is to take the baby off the breast toward the end of the feeding and put her in her bed. Let her fuss for a few minutes if necessary. You can pick her up and nurse her again for a couple of minutes only but then put her in the crib and let her find her fingers or let her fuss. Give her a chance to try and fall asleep. If she's really upset, nurse her again briefly and then try to put her down again. Just be determined that she isn't going to fall asleep at the breast. This is hard for the first couple of times but then your baby should have figured out how to fall asleep when you put her down. I tried this with my baby and it really works.

I  agree with the recommendation for "The No Cry Sleep Solution" book - lots of good ideas there.  I also found that swaddling helped my baby sleep on her own.