Is this normal?

La
My cousins 4 week old constantly is latched onto her. She will go from 45mins to 1 1/2 each feeding and feeds at least 8 times a day. When she pumps she is only getting 4oz a day! If she tries to wean the baby off she just cries. Is the baby just using her as a pacifier, is this normal? Suggestions please 
I also breastfeed but I don't have this problem so I don't know what to suggest.