I would get rid of the nipple shield. The lactation consultants did the same thing with me with my first. My nursing didn't last but about 6 weeks because of it. My milk supply didn't grow to meet his needs, and even when my nipples did come out my son was already used to the shield, etc., etc., etc. I would get rid of it.
Just because one has flat or inverted nipples doesn't mean they can't nurse without them protruding, as I found out. I just had my 5th child (3 months old now) and he is doing fine and nursing up a storm with the way mine are. Sometimes when he nurses, they are flat, but no big deal....they can still nurse.
I would pump if she really needs them to come out for her sake, but I really would get rid of it. I told another lactation consultant about the shield that I had used with my first child and even she agreed that will slow down milk supply as well as you can nurse without that thing. I think it depends on the consultant.
Anyway, good luck!