L.C.
It's not nipple shields that she needs, it's a product called 'breast shells'.They're hard plastic, worn between feedings and placed over the breasts so that they press all around the areola and the nipple protrudes into the hole.
She may not actually have inverted nipples (it was a popular misdiagnosis in the 90s, now it's rarely seen) but may actually be really engorged. The solution (to both) is to nurse really frequently. Like every 20-30 minutes during the day for the first several weeks.
Babies exert 90 pounds per square inch suction --that's a lot more than a vacuum does, so her dd will 'pull' the nipple out when she's latched on properly (big mouthful, with the nipple pointing up toward her ears, not to the back of her mouth).
It's a good idea to have no one but mom handle the baby (or mom's breasts) while the babe's investigating things. Too much stimulation from too many people actively interferes with her instincts, which prevent her from doing what she was born knowing how to do. Mom and babe need to spend huge swaths of time undressed (from the waist up) and just 'hanging out' together, to establish a physical communication style that suits them both. If the room is cool, the babe and mom can be covered up, but skin-to-skin will help a lot.