I think that the keys to making progress are patience, repetition, not taking anything personally, and being nonjudgmental.

When she interrupts, you could try "Remember not to interrupt others", said nonjudgmentally. You may have to say that many times. Stay patient and nonjudgmental.

With regard to your chest, don't act as if she is being inappropriate. Rather, think that she is trying her best, but needs guidance.

I like what MuddyBoots suggested. You could say "It's good to look at people's foreheads." When you notice her looking at your chest you could say "Remember to look at people's foreheads." You might have to say this many times. Stay patient and nonjudgmental.