For some reason, she was not convinced.
For instance, you could employ geofencing and remind them of daily chores they may have forgotten, when they leave the house. Of course, geofencing is pretty imprecise at the moment - at least on my iPhone 4.
Much the same way, you could ask them to fetch something from the grocery store, if they're nearby or already there. That way, it gets less annoying than a text message at work, instance.
Having to check a website or app for chores is something that itself feels like a chore. Automated reminders and such that ping the person are the way to go, I think. Or electronics built into daily appliances and such.