First, breathe. You are doing awesome.
Here's the most important thing to remember: Watch the baby, not the clock. Is she happy, satisfied, growing on her own curve? Is she having the appropriate number of wet/dirty diapers? Here's some really good info on how to tell if your baby is getting enough milk:
http://www.kellymom.com/bf/supply/enough-milk.html
Here's the other thing to remember: Shields make nursing really, really inefficient. Babies have to work harder, milk transfer isn't as effective, and it just takes longer. Now that she's off the shield, she's able to efficiently get the milk she needs! Chances are, she's getting even more now that she's able to nurse directly from the breast without the shield in the way! I know that based on research AND my own experience with the shield. Nursing got way faster and easier once we were able to toss the blasted thing.
Don't worry about foremilk/hindmik. Your body produces exactly what your baby needs in just the right way. Relax, breathe, and trust in yourself. You are already doing so awesome! Keep it up!