Need help figuring out what this voodoo doll means?

It's strictly to scare, nothing more or less. Don't take it personally. Whether or not she worshiped the devil has nothing to do with her practice of Voudou. You really have nothing to worry about. If you feel she is trying to be malicious, just pray to your God/ess or whomever you follow or believe in to protect you from any ill wishes. I seriously, like I said, Wouldn't worry about it all.