Lynda,
Reasoning with a demented person won't work. So you'll have to figure out another way. Can you hire a cook? Or a caregiver that can slip meds into snacks? Can you lie, and tell her that the Exelon patch is to keep her skin beautiful?
You might find some useful ideas here:
http://alzlibrary.wordpress.com/2009/07 ... -medicine/
And you might find some useful ideas from the short article on anosognosia from this post:
http://community.lbda.org/forum/viewtopic.php?t=1914
Finally, you can do a search of past posts on the topic of "refusing to take medication" as this has come up before and there may be good ideas raised by others in the past.
Robin