I'm sort of worried maybe she's starting to have some issues or something.
Just keep telling her that you like her looks and she has nothing to worry about, that she'll grow into her big nose when she's a little older.
LOL...sorry, not meaning to make fun of you here. It's just so cute. Yes, it's normal. Lots of dogs do that. Lyric use to also and the mirror he was looking in was on a wall and on the other side is my den. He'd look, growl, then go into the den and look at the wall on that side.....come back, look in the mirror again and growl. ROFLOL!