I'd think "tacky".
Candy is one of those nicknames that sounds more like a literal nickname (as in a pet name used affectionately) than just a diminutive. It also doesn't sound very mature on a grown woman. At least a Candace/Candice or
Candida would have the full name to fall back on. Someone legally named
Candy doesn't have a choice.
This message was edited 8/9/2016, 1:32 PM