To continue to pump or not?

Sara
Had a breast reduction in 08 and now having trouble producing milk. I am only pumping about 4oz total all day from both breast. So she gets formula mostly. I wondering if it even worth it to keep pumping for 2 bottles a day. Which soon will be less the more she eats. My husband is on the side of any amount of breast milk is great. Let me know what you girls think.