It's important that she stay moderately active. Don't make her scrub the floors or anything, but some dusting and vacuuming won't kill her. Soup is a good idea. Make sure she makes you an extra bowl or two while she is at it. She can still have sex too. Since she is sick though I'd skip the kissing and other foreplay. She probably won't have a ton of energy so be considerate and just stick to 3-4 minute quickies. I'd try to stay out of her way so she can recover. Maybe you could use the time to put in a couple extra rounds of golf or go out drinking with your friends. It would also be nice to try and cheer her up a little. Since she probably won't have much of an appetite you can point out that now she might finally be a to lose a few pounds.