R.M.
PLease don't think that you are doing something "wrong" with your breastfeeding!!! You can expect your daughters sleep habits to change as she grows...it seems to me that when my children ( and now my grandchildren) had sleep issues it was because they were getting ready to make a "leap forward" in their learning process. It is like their brains are working overtime to "rewire" and take in the new information and it somehow effects their sleep patterns. My youngest grandson, who just turned a year old, was driving his parents CRAZY ( who also cosleep with him) he would be up all hours of the night...not content to just nurse and go back to sleep but demanding that Mom sit up and holdh im or get up and walk with him while he nursed. This week...he has started walking...picked up about 8 new signs ( they use baby sign language) and voila...his sleep is going back to "normal" again.
That being said...make sure you are keeping your liquid intake up...so that your body is producing maximum amounts of milk for the hungry baby...and bring that little one on into your bed....both of you will sleep better!!!
And I applaud you for not going to the CIO method to get her to go to sleep. I never did use that with any of my children...and my daughters are not using it with their sons. I just don't think that it is the message we want to send to our children...that when they are awake and needing/wanting attention and comfort that we turn out backs on them and just let them scream. I think that a child should grow up knowing that their Mother and Father is always ....ALWAYS going to be there for them when they need them.
Good luck...it WILL get better...I promise!!