In all sincere honesty,, her throwing away your candy then denying it,,, man,, she has as they say "some issues"..... 

She has assumed the role of boss, trying to control something she perceives is bad even thou it is something you enjoy eating.  Passive agressive sticks out like a sore thumb. She thinks she is in control, yet does not have the intestinal fortitiude to actually talk to you about the candy, so she throws it away then denies it when caught.

Might want to take a look at this site,,??

http://www.nami.org/Template.cfm?Section=By_Illness&Template=/TaggedPage/TaggedPageDisplay.cfm&TPLID=54&ContentID=44780  

I'm not saying this is the problem,, but there is something Wrong. Throwing something away that belongs to another person, (even one's spouse) then denying it is a strong indication 'something' is seriously wrong.