I apologize for not replying sooner. I just got home. This is for you just for you in case you have more piglets, Here is a pic of the hooves of a newborn piglet that would have been born dead or died prior to walking. You can see the protective coating on the hooves to protect the mother through the birth.
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The reason I was asking if the piglets were born alive or dead can give a key to what was might have been going on. Dystocia during birth will usually result in meconium staining. That means there was some type of stress during the birthing and the piglet's meconium was passed while it was still in the birth canal. That means the piglet, the placenta and/or the birthing fluids could be stained a yellowish color. That's "usually" a sign that things aren't right. A clean dead piglet could just mean a dead piglet. Or it could mean birthing didn't progress normally. It's clues to what may have happened and what might be happening.
I'm glad that she appears normal. Hopefully everything's fine if you didn't feel anything. When a birth progresses normally, usually all the signs exhibited by the birthing female are normal as well. BUT, if there have been issues a female may not present normal signs...or even distress. They may act somewhat normal. It's called uterine inertia. There can be a partial or total absence of contractions. We've experienced it from time to time within our range of livestock. I don't want to cause concern or scare you. I simply want you to be aware.
She sounds like a lovely pig. 
