Thanks to all! I have a good idea now of what size to lean towards. She is pretty tiny so it won't have to be really big. And I always use the warm and natural batting. I love how it looks after it has been washed.
Now I just need to find a pattern! That is always the hard part for me. I don't want anything too complicated or she will be gone before I get it done! Of course her mother lived to be 102 so I may have plenty of time.
Off to browse through my quilt mags to find an idea :)