Made food for our friends after the birth of their son haven't heard anything back. Isn't that rude?

That is rude, but I remember how hard things were for me after having a baby. Of course, I didn't feel like being on the computer or anything either, so if she's already on FB she must be feeling better than I did! But try to give them the benefit of the doubt and give it a few more days. I had so many people bringing me dinner that it was hard for me to remember whose dishes were whose. If you still don't hear from her after a few days, give her a call, ask how she's doing and then ask for your dishes back. Be casual about it and just see what she says.