Are you following the same path that so many others are following by telling people to rip out perfectly good *historical* original fabric?
If the original materials are in good shape there is *no* reason to tear it out. If she needs better insulation there are other ways of doing it.
Why do you think that so many "professionals" in the restoration trade do not watch TV shows for this very reason? I mean I even saw one program that showed how to rip out plaster to install drywall...The reasoning? Because drywall is better! ..... sheesh.....
Nancy....Do youself and your home a *big* favor. Leave as much of the original fabric as you can and restore it.....Not only for yourself but for posteriety.