Voluntary TPR - how does that work?

Biomom voluntarilly surrendered and biodad was TPR'd by default. Bmom only decided to do it when a TPR trial was setup and she knew we were going to adopt. She was not allowed to make any conditions whatsoever though and we did not do any visitation agreement, etc... She did mail me the TPR papers she signed saying "I did sign these with a heavy heart. I hope she understands." It was sad :(