6 week old fighting sleep?

My daughter is six weeks old and all of the sudden started fighting sleep. Nothing will get her to bed except for laying down and cuddling. At night time we've been co sleeping because she's colic and it's the only way we could get sleep. (Not what we wanted to do though) But I was wanting to see if anyone had any suggestions on getting her to sleep? She's swaddled every time, and usually she likes it. She does use a paci.. Sometimes. She will fall asleep breastfeeding about 50% of the time, but the second I move she's wide awake again. We've tried white noise, it calms her, but doesn't out her to sleep. Swing is hit or miss. I feel like we've tried everything. I'm against letting her crying it out because she's so young.