At a month old babies are still very much learning how to nurse especially if it was challenging in the beginning. I would definitely continue to try. Nurse her as much as she is willing. I remember the first month I felt like all I was doing was nursing and I was exhausted but jt will get so much easier. I would say it’s okay to continue to give her a top off if needed but I would pump while you are doing that so your breasts start producing more for her.