Not sure what her medical condition is, but if she's able to get out, or if someone can help her, there are places such as
Dinner by Design where you you go and put meals together to freeze. I have not been to one, but several neighbors go regularly. The food is all prepped and chopped - she or someone else would just need to put it together in the containers. I'm not familiar with Berwyn, but for groceries,
www.peapod.com delivers, so it would be one way to ensure she has some staples.