Can you wear her skin to skin a lot? I found that really helped me and my baby get in synch. Also, if he was falling asleep and took him off, burped him, and switched sides. I kind of figured out his schedule-I knew he had a habit of falling asleep at say 10 minutes into the feeeding. So, at eight minutes I would burp him and switch.
I did not have to do this for long at all-wearing him really seemed to help us establish a good nursing relationship (and he was tongue tied so also had suck issues).
The other thing that truly helped me was weighing my son before nursing and then weighing him after. He would gain four ounces so I knew he was getting enough. Once I could relax about him getting enough, we both seemed to be able to settle into a relationship and once his tongue tie was corrected his suck improved tremendously.