Hi, I wanted to ask a question about the after pregnancy behaviors in a yorkie. Sophie just had her puppies yesterday but one died

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She has been an excellent mommy to her only pup, but one thing that worries me is that she's often picking it up and moving it from her pet bed to the "labor pet bed" (a larger one), so I tried putting her pet bed inside the "labor" bed one and she still continued to pick it up and taking it to other places. The pup was crying the whole time she was carrying it. What should I do? At first I took it away, because I thought she was being aggressive but then I let her do whatever she wanted to do, after all nature takes over and she's the mom. I just am worried, she's still doing it. Please help!!