Firstly she now knows that the breast is how she gets back to sleep, she knows no other way, so you need to work out another way to do it & stick to it as long as it takes. With my ds#1, my dh used to help out & also I would walk the house to calm him down sometimes.
Does she fall asleep for naps & bed time by feeding? as you will need to break that habit too if it is the case.
When she is awake you also need to help her learn how to get back to lying down again, so she can do it at night too