Hi Star,
Does she have any favorite foods or foods she'll at least consistently eat? Perhaps you can grind the pills up and hide them in there? Before doing that, though, consult with her doc or at least a pharmacist. Some medications are time-released and crushing them will affect the way they are metabolized.
Another idea is talking to her docs and family about her non-compliance with taking her meds. Maybe there are some changes that can be made to make it easier. If she's taking something twice a day, for example, maybe there's something else she can taken once a day, at least only making you face this battle once rather than twice.