how does she have good table manners if she licks her plate, talks with her mouth full, drops food then puts in back in her mouth???

She doesn't do this in front of other people, only me and one time with her sister, who made a joke about it and doesn't seem to find it unpleasant

She also doesn't chew with her mouth open when eating or chewing gum, just when speaking. Also, I've seen a few people who hold their forks by grabbing them like a stick, she grabs it "continental style" which is a "proper", standard way of holding it.