I think as long as you take all the little bits away it should be okay. My DD is pretty good with choking hazards though and will show me if she's unsure if she can have something. I think most of the baby born features might be lost on someone so young though. I also don't know how the baby food in the baby born will go. Your DD might try to help by feeding the baby..

Maybe just get a soft bodied doll so she can give it good cuddles wthout hard bits? DD has one she loves and also a hard bodied one she takes into the bath with her (although given how she whacks that one around we'll have to watch her with new bub coming).

i also plan to get DD a special doll except I was going to give it to her when she came to meet her new sibling as a present from the new baby. she loves all of her dolls.