Brestfeeding help

Jennifer
My baby girl is a premie and I'm brestfeeding. When she was in the hospital I pumped and gave them the milk. She came home when she was a week old, I was just brestfeeding her for the first week but she wasn't gaining enough weight. I was told to feed her then pump and give her the rest in a bottle. That she was not strong enough to get all the milk out of my boobs by herself. So now she is 6 weeks old and I am still brestfeeding then pumping and giving it to her. I want to have her 100% on the boobs but I'm not sure how to get her there! Do anyone know how I can get her on my boobs 100% any advice would be helpful. Thank you!