I have a late PM doll, and I do not believe she is fragile. I managed to destroy the pram, yet the doll still has shiny hair. I think I must have been smart enough to leave her hair tied in her ribbon (looking at my mini Sam, her hair is also tied in the original style with meet ribbon). The only thing I would note is that my nutcracker is attached with a flimsy string I believe will break any day now. It does not stay in place well. In addition, the nutcracker has stained poor Clara's hand red/pink.
So, I would disagree that a child should not play with this. The idea of a doll (Sam) with a doll (Clara) with a doll (nutcracker) is just too adorable and picturesque. She is possibly my favorite Sam accessory, though I did play with mini Sam way more than Clara.
I give Clara an A+, and the nutcracker a B-, since at least its arms didn't fall off like a previous member posted.