For the past few days my Grandma has been complaining that EVERYTHING is sweet. Water, toast, cheerios, and so on. I made some 5 alarm chili, she took a bite of it when I wasn't looking and she spit it out saying it was too sweet. Is this normal?
No. It isn't. And more to the point, it isn't even normal for your grandmother, which is what counts - as you say, this is "for the past few days." Report a change in taste to her doctor, don't try to guess what it might be.